AP BIO Unit 5 Test Review

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78 Terms

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What are homologous chromosomes?
Two chromosomes with the same set of genes, sometimes with different alleles
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What is a gene?
basic unit of heredity and a sequence of nucleotides in DNA or RNA
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What is an allele?
Different forms of a gene
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Purpose of meiosis
produce gametes
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Why in meiosis the chromosome number is halved?
Halves the sex cells in half, so that in fertilization, it will result in a normal amount of chromosomes (46 -\> 23)
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What is the end product of meiosis?
4 haploid cells
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stages of meiosis in order
Interphase, Prophase I, Metaphase I, Anaphase I, Telophase I, Prophase II, Metaphase II, Anaphase II, Telophase II
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What happens in meiosis I?
* Homologous chromosomes pair up
* Homologous chromosomes separates
* Two haploid cells are made with their sister chromatids still joined.
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What happens in meiosis II?
* Sister chromatids separate
* 4 haploid daughter cells are formed
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Significance of meiosis
Causes genetic variation
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How is genetic variation achieved?
* crossing over
* independent assortment
* random fertilization
* mutations
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What is crossing over?
exchange of genetic material between homologous chromosomes
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How does crossing over contribute to genetic variation?
Crossing over creates new combinations of genes in the gametes that are not found in either parent
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What is independent assortment ?
random separation of homologous chromosomes
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How does independent assortment contribute to genetic variation?
each gamete ends up with a different set of DNA

* independent assortment affects which chromosomes end up in each cell
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How does random fertilization contribute to genetic variation?
each parent to randomly contributes a unique set of genes to a zygote
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What is a recessive allele?
A form of a gene that is not expressed when paired with a dominant allele
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What is a dominant allele?
A form of a gene that is fully expressed, even when two different alleles are present
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What is the law of segregation?
Parents pass on only one allele for each gene
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What is the law of independent assortment?
during gamete formation, different pairs of alleles segregate independently of each other

* EX. which allele a gamete receives for gene A has no bearing of which allele a gamete receives for gene B
* ONLY DEALS WITH UNLINKED GENES
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What are unlinked genes?
genes located on different chromosomes
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What are linked genes?
genes located on the same chromosome that tend to be inherited together
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What is a punnett square?
A chart that shows all the possible combinations of alleles that can result from a genetic cross
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What is a dihybrid cross?
a cross that examines the inheritance of two different traits
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What is the probability rule regarding multiplication?
Independent events that occur in a sequence; "AND"
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What is the probability rule regarding addition?
Events not happening in a sequence; "OR"
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What is incomplete dominance?
when one allele is not completely dominant over the other; blending of traits from parents (red+white\=pink)
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What is codominance?
both alleles contribute to the phenotype
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How does the environment affect phenotype?
Exposure to certain things in the environment can affect gene expression and what phenotype is displayed.
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What is a pedigree?
a chart that tracks which members of a family have a particular trait
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What is autosomal recessive?
no skipping, many affect; two recessive needs to be present in order for the disease or trait to develop.
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What is autosomal dominant?
Dominant in a trait that is not directly involved in determining sex; no skipping and many affected
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What are sex-linked traits?
Traits controlled by genes located on sex chromosomes.
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What is X-linked recessive?
mother/son and father/daughter links, skipping of gen
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What is x linked dominant?
* Expressed in female in one copy
* more males affected
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What is mitochondrial inheritance?
trait inherited from the moms and passes down to all kids
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What is a genetic map?
ordered list of the genetic loci along a particular chromosome
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What is nondisjunction?
Failure for chromosomes to separate properly.
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What can nondisjunction lead to?
genetic abnormalities and chromosomal disorders
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Name the 5 altercations of chromosome structure (mutations).
* deletion
* insertion
* duplication
* translocation
* inversion
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What is a deletion mutation?
one nucleotide is taken away from a gene or DNA sequence
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What is an insertion mutation?
The addition of a single nucleotide
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What is a duplication mutation?
repeats a segment
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What is an inversion mutation?
Reverses a segment within a chromosome

* BDE -> BED
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What is a translocation mutation?
moves a segment from one chromosome to another, nonhomologous one
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What type of chromosomal mutation is least disruptive?
point mutation because one base pair is exchanged and frame shift does not occur
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What does mitosis produce?
2 identical diploid cells
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What does meiosis produce?
4 differing haploid cells
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What does meiosis result in?
daughter cells with half the number of chromosomes as the parent cell
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What happens in anaphase II?
sister chromatids separate
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Where does crossing over occur?
prophase I
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Where does random assortment occur?
metaphase I
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These chromosomes possess the same structure and genes, but are not identical. They contain different alleles for the same genes. Offspring receive one from each parent.
homologous chromosomes
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Name the pattern of inheritance: males primarily affected. Women are typically carriers because they have 2 X chromosomes. Fathers cannot pass on to sons.
x linked recessive
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once you solve for chi square to make meaning of your calculation, what is your next step?
determine the degrees of freedom
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The closer two linked genes are on a chromosome, the ______ likely they are to be separated by crossing over?
less
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the environment can change the ________ of an organism
phenotype
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Choose the correct genotype for two traits of a recessive individual in a pure breeding parent generation
aabb
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a type of mutation where chromosomes do not separate properly during meiosis
nondisjunctional
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Diploid number is 50, what is haploid number?
25
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process by which sexually reproducing organisms produce genetically diverse haploid gamates?
meiosis
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crossing over results in…
recombinant chromatids
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Name the inheritance pattern: affected mothers with all affected children
mitochondrial
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two genes on the same chromosomes have a recombination frequency of 25%. How many map units are they apart from each other?
25 map units
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How many cell divisions are in meiosis?
2
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During crossing over ________ exchange genetic information
non sister chromatids of homologous chromosomes
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Name the pattern of inheritance: unaffected parents have affected offspring
autosomal recessive
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Chromosomes moving to opposite ends of the cell during anaphase takes place during….
both mitosis and meiosis
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Due to light level changes in the environments, an arctic hare’s fur changes from white to brown depending on the season. How has the hare changed?
the phenotype changed
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T/F Homologous chromosomes separate during anaphase I
TRUE
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Mutations during _______ can be passed on to offspring
meiosis
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Chi square vale is 6.2. Critical value is 7.81.
fail to reject the null. results are due by chance, the chi square value is less than the critical
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3 ways meiosis contributes to genetic diversity
fertilization, crossing over, random assortment
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reproduction that does not require the production and fusion of gametes?
asexual reproduction
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a benefit of sexual reproduction
increases genetic diversity
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Choose the correct genotype for an individual who is homozygous dominant for two traits
AABB
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Chromosomes lining up in the middle of the cell takes place in….
both mitosis and meiosis
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T/F When genes are linked the majority of the phenotypes of the offspring will resemble the phenotypes of the parents
TRUE