BIOL Final Mastering Assignments

Which is the allele for white flower color?

a

Which is the allele for purple flower color?

A

What color of flowers will a heterozygous pea plant produce?

purple

Which of these would represent the heterozygous genotype?

Aa

If a pea plant makes purple flowers, what is its genotype?

cannot be determined

If a pea plant that makes purple flowers is said to be "heterozygous purple" what is its genotype?

Aa

If a pea plant makes white flowers, what is its genotype?

aa

Which of these would represent the homozygous dominant genotype?

AA

If a pea plant that makes purple flowers is said to be "homozygous purple" what is its genotype?

AA

If a pea plant is said to have the dominant phenotype, what is its genotype?

AA or Aa (need more info to decide)

If a pea plant is said to have the recessive phenotype, what is its genotype?

aa

What genotype ratio is predicted for offspring from AA x AA?

all AA

What genotype ratio is predicted for offspring from AA x Aa?

1 AA : 1 Aa

What genotype ratio is predicted for offspring from AA x aa?

all Aa

What genotype ratio is predicted for offspring from Aa x Aa?

1 AA : 2 Aa : 1 aa

What genotype ratio is predicted for offspring from Aa x aa?

1 Aa : 1 aa

What genotype ratio is predicted for offspring from aa x aa?

all aa

In pea plants purple flower color is dominant over white flower color. A pea plant that is homozygous purple-flowered is crossed with a pea plant that is white-flowered. Which answer fits the predicted phenotype(s) of their offspring with respect to flower color?

100% purple

In pea plants purple flower color is dominant over white flower color. A pea plant that is heterozygous purple-flowered is crossed with another pea plant that is heterozygous purple-flowered. Which answer fits the predicted phenotype(s) of their offspring with respect to flower color?

75% purple: 25% white

In pea plants purple flower color is dominant over white flower color. A pea plant that is white-flowered is crossed with another pea plant that is white-flowered. Which answer fits the predicted phenotype(s) of their offspring with respect to flower color?

100 % white

In pea plants purple flower color is dominant over white flower color. A pea plant that is heterozygous for flower color is crossed with another pea plant that is white-flowered. Which answer fits the predicted phenotype(s) of their offspring with respect to flower color?

50% purple: 50% white

In pea plants purple flower color is dominant over white flower color. A pea plant that is heterozygous purple-flowered is crossed with another pea plant that is heterozygous purple-flowered. Which answer fits the predicted genotype(s) of their offspring with respect to flower color?

1 AA : 2 Aa : 1 aa

In pea plants purple flower color is dominant over white flower color. A pea plant that is homozygous purple-flowered is crossed with another pea plant that is white-flowered. Which answer fits the predicted genotype(s) of their offspring with respect to flower color?

all Aa

In pea plants purple flower color is dominant over white flower color. A pea plant that is white-flowered is crossed with another pea plant that is white-flowered. Which answer fits the predicted genotype(s) of their offspring with respect to flower color?

all aa

In pea plants purple flower color is dominant over white flower color. A pea plant that is heterozygous for flower color is crossed with another pea plant that is homozygous purple-flowered. Which answer fits the predicted genotype(s) of their offspring with respect to flower color?

1 AA : 1 Aa

In pea plants purple flower color is dominant over white flower color. A pea plant that is heterozygous purple-flowered is crossed with another pea plant that is homozygous white-flowered. Which answer fits the predicted genotype(s) of their offspring with respect to flower color?(Don't be thrown off by "homozygous white-flowered" - of course they are homozygous, since white is recessive. I could have just said "white-flowered" and it would mean the same thing.)

1 Aa : 1 aa

In pea plants purple flower color is dominant over white flower color. A pea plant that is homozygous purple-flowered is crossed with a pea plant that is white-flowered; this is the parental generation. One of their F1 offspring is allowed to self-fertilize. Which answer fits the predicted phenotype(s) of the offspring in the F2 generation with respect to flower color?

75% purple: 25% white

In pea plants purple flower color is dominant over white flower color. A pea plant that is white-flowered is crossed with a pea plant that is white-flowered; this is the parental generation. One of their F1 offspring is allowed to self-fertilize. Which answer fits the predicted phenotype(s) of the offspring in the F2 generation with respect to flower color?

100 % white

In pea plants purple flower color is dominant over white flower color. A pea plant that is homozygous purple-flowered is allowed to self-fertilize; this is the parental generation. One of the F1 offspring is also allowed to self-fertilize. Which answer fits the predicted phenotype(s) of the offspring in the F2 generation with respect to flower color?

100% purple

In pea plants purple flower color (allele A) is dominant over white flower color (allele a). A pea plant that is purple-flowered is crossed with a pea plant that is white-flowered; these are the P1 or parental generation plants. The cross produces 80 offspring (F1 generation); 35 are purple-flowered, and 45 are white-flowered. Based on this, what are the most likely genotypes of the P1 plants?

Aa and aa

In pea plants purple flower color (allele A) is dominant over white flower color (allele a). A pea plant that is purple-flowered is crossed with a pea plant that is white-flowered; these are the P1 or parental generation plants. The cross produces 80 offspring (F1 generation); all are purple-flowered. Based on this, what are the most likely genotypes of the P1 plants?

AA and aa

You examine a vial of 100 flies that are all offspring from a single genetic cross. You see only red-eyed females present, but you see both red-eyed and white-eyed males present. The genotypes of the parents were:

XRXr; XRY

You examine a vial of 100 flies that are all offspring from a single genetic cross. You find both red-eyed females and white-eyed females as well as both red-eyed males and white-eyed males. The genotypes of the parents were:

XRXr; XrY

You examine a vial of 100 flies that are all offspring from a single genetic cross. You find only red-eyed females and red-eyed males present. Flies from the vial were allowed to interbreed, and in the next generation you find only red-eyed females, but you find both red-eyed and white-eyed males. The genotypes of the original parents were:

XRXR; XrY

You examine a vial of 100 flies that are all offspring from a single genetic cross. You see only red-eyed females and white-eyed males present. The genotypes of the parents were:

XrXr; XRY

You examine a vial of 100 flies that are all offspring from a single genetic cross. You find only red-eyed females and red-eyed males present. Flies from the vial were allowed to interbreed, and in the next generation you still find only red-eyed females and red-eyed males. The genotypes of the original parents were:

XRXR; XRY

You examine a vial of 100 flies that are all offspring from a single genetic cross. You see only white-eyed females and white-eyed males present. The genotypes of the parents were:

XrXr; XrY

In humans, brown eye color (B) is dominant over blue eye color (b). A brown-eyed woman and a brown-eyed man mate and have a blue-eyed son as their first child. What are the most likely genotypes of the parents for the eye color gene in question?

father Bb, mother Bb

In humans, brown eye color (B) is dominant over blue eye color (b). A brown-eyed woman and a brown-eyed man mate and have a blue-eyed son as their first child. They eventually have 4 children. Which of the following represents the possible genotype(s) of the children of this couple?

BB, Bb, and bb

In humans, brown eye color (B) is dominant over blue eye color (b). A brown-eyed woman and a brown-eyed man mate and have a blue-eyed son as their first child. Which of the following gives the correct odds for the likely eye colors for children of this couple?

75% brown, 25% blue

In humans, brown eye color (B) is dominant over blue eye color (b). A brown-eyed woman and a brown-eyed man have 4 children; 3 have brown eyes, and 1 has blue eyes. If the couple were to have a 5th child, what is the probability that it would be homozygous dominant for eye color?

1/4

In humans, brown eye color (B) is dominant over blue eye color (b). A brown-eyed woman and a brown-eyed man have 4 children; 3 have brown eyes, and 1 has blue eyes. If the couple were to have a 5th child, what is the probability that it would be heterozygous for eye color?

1/2

What are the possible phenotypes of the children if the mother's genotype is iOiO for blood type and the father is IAIB?

1/2 A: 1/2 B

What are the possible phenotypes of the children if the mother's genotype is IAiO for blood type and the father is IBiO?

1/4 A: 1/4 B: 1/4 AB: 1/4 O

A woman with hemophilia marries a man who is normal for blood clotting (and thus does not have hemophilia). Knowing that hemophilia is X-linked recessive, you can predict that if they produce children:

all of the boys and none of the girls will have hemophilia.

When columbines with pale blue flowers are mated they produce offspring that make either dark blue, pale blue, or white flowers. The ratio is 1 dark blue: 2 pale blue: 1 white. Inheritance of flower color in columbines is apparently an example of:

incomplete dominance.

NOTE: This data in this question were made up. In humans, the gene for cystic fibrosis is linked to a gene for a rare form of "blue/yellow" colorblindness. Both of these are recessive. In a study of a small population, several matings were recorded between individuals heterozygous for both genes. The offspring phenotypes were recorded as follows:46 % without cystic fibrosis and with normal color vision 4 % without cystic fibrosis and with blue/yellow colorblindness 4 % with cystic fibrosis and with normal color vision 46 % with both cystic fibrosis and blue/yellow colorblindness. What is the map distance between the genes for these two traits?

8 map units

In some cattle having horns is controlled by a single gene, with the dominant allele leading to no horns and those homozygous for the recessive allele having horns. You have a bull without horns and want to determine if he is homozygous dominant or heterozygous. You perform several test crosses and find that about half of his offspring have horns. What is the genotype for your bull?

heterozygous

Two genes control rooster combs, producing four possible forms. When dihybrid crosses are performed the male offspring have the four forms in a 9:3:3:1 ratio. This is an example of:

gene interactions.

In roses assume that red or yellow flower color is controlled by a single gene with two alleles. When you cross roses with yellow flowers with each other you always get only roses that produce yellow flowers, but when you cross roses with red flowers with each other you sometimes get offspring that produce yellow flowers. If you take one of the rose plants with red flowers that sometimes produces offspring with yellow flowers and cross it with a rose plant that makes yellow flowers you would expect that their offspring will be:

1/2 red flower producers: 1/2 yellow flower producers

In humans camptodactyly (inability to straighten the little finger) is a dominant trait governed by normal Mendelian inheritance for a single autosomal gene with two possible alleles. A man with camptodactyly has one child, and that child is not able to straighten his little fingers. What is the genotype of the man with respect to camptodactyly?

cannot be determined without more crosses

In peas, the allele for tall (T) is dominant over short (t), and the unlinked gene for seed coat has the allele for smooth coat (R) dominant over wrinkled coat (r). If a pea plant that has genotype TtRr is allowed to self-fertilize, the expected phenotypic ratio of its offspring would be:

9 tall, smooth: 3 tall, wrinkled: 3 short, smooth: 1 short, wrinkled

In peas, the allele for tall (T) is dominant over short (t), and the unlinked gene for seed coat has the allele for smooth coat (R) dominant over wrinkled coat (r). The expected phenotypic ratio of offspring from the cross Ttrr x ttRr would be:

1 tall, smooth: 1 tall, wrinkled: 1 short, wrinkled: 1 short, smooth