bio 303 wladman

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Eukaryotic cells differ from prokaryotic cells in that

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1

Eukaryotic cells differ from prokaryotic cells in that

B. only eukaryotes have a true nucleus.

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An allele is

C. a form of a gene.

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If two chromosomes of a species are the same length and have similar centromere placement

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but are not homologous, then

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A. one chromosome might be metacentric while the other one might be acrocentic

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B. one is maternally inherited while the other is paternally inherited

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C. the chromosomes contain the same set of genes

D. none of the above

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If a typical diploid somatic cell of an organism has 64 chromosomes, how many chromosomes are

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expected in each gamete of that organism?

C. 32

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If a G1 somatic cell nucleus in a Myrmecia pilosula contains 2 picograms of DNA, how much DNA

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would be expected in a gamete from this organism?

D. 1 picogram

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Karyotypes are made using chromosomes at which stage of mitosis?

D. Metaphase

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During spermatogenesis in an animal species with a normal haploid number of 6, one tetrad

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undergoes nondisjunction during the first meiotic division. Following the second meiotic division,

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how many of the four gametes produced should contain only 5 chromosomes?

B. 2

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The synaptonemal complex

B. forms during prophase I of meiosis

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For an organism of genotype Aa, half of its gametes contain only the A allele and half contain only

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the a allele. This is essentially Mendel's law of

A. segregation

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19

Pigeons may exhibit a checkered or plain color pattern. When checkered pigeons were crossed

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with plain pigeons, 38 F1 offspring were produced and they were all checkered. When the checkered

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F1 offspring were crossed, 28 checkered and 9 plain offspring were produced. From this data, the

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simplest conclusion is

B. Checkered is dominant to plain.

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23

A recessive allele in tigers causes the white tiger. Two normally pigmented tigers are mated and

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produce a white offspring. If the two adult tigers produce a second offspring, what is the probability

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that it will have normal pigmentation?

D. 75%

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26

In each one of Mendel's dihybrid crosses,

B. simple dominance and recessiveness were seen.

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In a cross AaBbCc x AaBBcc, where capital letters refer to dominant alleles, what is the

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probability of producing an offspring that has a dominant phenotype for all three characteristics?

D. 3/8

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A 9:3:3:1 ratio of phenotypes in the F2 generation of a dihybrid cross

A. indicates that the dihybrid cross is basically equivalent to two independent monohybrid

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crosses.

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In corn, purple kernels are dominant over yellow kernels and full kernels are dominant over

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shrunken kernels. A true-breeding plant with purple, full kernels is crossed with a plant with yellow,

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shrunken kernels. The F1 plants have purple, full kernels. In the F2 generation, what proportion of

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the plants would be expected to have purple, shrunken kernels?

B. 3/16

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35

In a cross between two plants of the following genotypes: (AaBb x AaBb), which one of the

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following genotypes should occur in 1/8 of the offspring?

B. AABb

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If an individual has the genotype AaBbCCDD and all four genes assort independently, how

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many different types of gametes should that individual produce with respect to the four genes?

B. 4

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39

Each of the following statements about meiosis is true EXCEPT

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A. the products of meiosis are haploid.

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B. most somatic cells do not enter into meiosis.

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C. during meiosis, crossing-over often occurs between non-homologous chromosomes.

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D. the complete process of meiosis requires two rounds of cell division.

C. during meiosis, crossing-over often occurs between non-homologous chromosomes.

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In terms of genetic content,

A. sister chromatids are identical right after DNA replication

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In animals, how many functional eggs are generally produced from one complete round of

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meiosis in a female?

A. one

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47

For the pedigree below, the condition depicted is

A. autosomal dominant

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Consider the following pedigree for a very rare trait (in second and third generations of males not infecting parents and kids but across the family tree)

D. sex-linked recessive

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Red-green color blindness is X-linked recessive. A color-blind woman has a child with a man

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having normal vision. Which phenotype is definitely NOT expected for the child?

A. color-blind female

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Consider a gene with alleles A and a. Suppose that the homozygous recessive genotype aa is

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lethal during embryonic development. Consider two other genes, B and C that assort independently

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from gene A and have no interactions with gene A. In a cross between two individuals, AaBbCc x

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AaBbCC, what percentage of the offspring should die during embryonic development?

C. 1/4

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A healthy man ("John") has a brother who has cystic fibrosis. John's parents are healthy. What

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is the probability that Johns' brother is homozygous for the cystic fibrosis allele?

D. 100% -- He's homozygous since we're told that the disease is recessive

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What is probability that John from question 25 is heterozygous for the cystic fibrosis allele?

C. 2/3

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What is the probability that John's mother is heterozygous for the cystic fibrosis allele?

D. 100%

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A condition in which one gene influences the phenotypic expression of another gene is called

D. epistasis

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The trait of medium-sized leaves in iris is determined by the genotype PP'. Plants with large

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leaves are PP, whereas plants with small leaves are P'P'. A cross is made between two plants each

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with medium-sized leaves. If they produce 80 offspring, what would be the expected number of

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offspring having medium sized leaves?

B. 40

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The trait of leaf-size in iris, as described in question 29 above, is an example of:

C. partial dominance

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For the cross AaBb x AaBb, if the genes assort independently, what fraction of the offspring

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would you expect to have the genotype A-bb where the hyphen can be either the dominant (A) or

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recessive (a) allele?

B. 3/16

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68

In a disputed parentage case, the child is blood type O (not Bombay) while the mother is blood

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type B. What blood type would exclude a male from being the father?

D. AB

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With which of the following would hemizygosity most likely be associated?

C. X-linked inheritance

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If a gene is subject to genomic imprinting, then

B. one inherited allele, either the maternal or paternal, is expressed while the other is silenced.

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Two fruit flies that are wingless are crossed, and it is discovered that all of their offspring have

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wings. This is an example of

A. complementation

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For the two parent flies in question 35 above, the genetic mutations in the two flies

B. are in two different genes

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Which statement is true?

A. two genes on different chromosomes will assort independently from one another.

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Which phenotype pair represents the "parental" or noncrossover type of offspring? (figure 1)

B. pair B

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Which phenotype pair represents the "double-crossover" type of offspring? (figure 1)

C. pair C

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Which two genes are the farthest apart on the chromosome? (figure 1)

A. black & curved

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In humans, the genetic basis for determining the sex "male" is accomplished by

C. the presence of the SRY gene

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The genotype XYY produces a

C. male in Drosophila and a male in humans.

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A somatic cell from a tetraploid person contains a total of how many chromosomes?

B. 92

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A balanced translocation

A. leads to the condition of "semisterility" even in the absence of any crossing-over.

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If an organism is heterozygous for a chromosomal inversion, then

C. meiotic crossovers within the inverted interval will not be recovered in offspring.

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84

Familial Down syndrome is caused by:

D. a Robertsonian translocation.

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A fertilized egg inherited one X and two Y chromosomes, but after several rounds of cell division in

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the embryo a cell is produced that has lost the X chromosome. Which of the following is a likely

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possibility regarding the individual that develops from this embryo?

C. the person will have little or no phenotype since the cell with no X chromosome likely dies.

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The individual whose karyotype is

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shown to the right

B. has Turner syndrome

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An abnormal chromosome in which the ends of the two arms are fused together is called

D. a ring chromosome

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Gene dosage compensation

A. is needed when one sex has fewer copies of a gene or genes than the other sex.

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When it comes to X chromosome inactivation in a human cell, transcription of the XIST gene is

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enhanced on

A. the X chromosome that will be inactivated.

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A calico cat

B. is female.

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The individual whose karyotype

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is shown to the right

B. displays triploidy

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The figure to the right depicts the formation of a (figure 2)

C. a structure that will lead to semisterility

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Forms of inheritance that do not follow typical Mendelian patterns and that appear to be more

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influenced by the parent contributing the most cytoplasm to the embryo are grouped under the

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general heading of

B. extrachromosomal inheritance

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