Question 1

In a dihybrid cross between two individuals with the genotype

AaBb

, assuming independent assortment and complete dominance, what is the probability of producing an offspring that is phenotypically dominant for the first trait and phenotypically recessive for the second trait?

Accepted Answer

Answer

Answer

Answer

Question 2

A researcher crosses a pea plant that is homozygous dominant for seed shape and seed color (

AaBb

) with a plant that is homozygous recessive for both traits (

rryy

). If the

F_1

generation is self-fertilized, which of the following represents the possible gametes produced by an

F_1

individual according to Mendel's Law of Independent Assortment?

Accepted Answer

Answer

Answer

Answer

Question 3

In summer squash, white fruit color (

AaBb

) is dominant over yellow fruit color (

rryy

), and disk-shaped fruit (

F_1

) is dominant over sphere-shaped fruit (

F_1

). If a plant with the genotype

WwDd

is crossed with a plant with the genotype

wwdd

, what is the expected phenotypic ratio of the offspring?

Accepted Answer

1:1:1:1

Answer

3:1

Answer

9:3:3:1

Answer

1:2:1

Question 4

In a cross between an individual with genotype

AaBb

and an individual with genotype

rryy

, what is the probability of obtaining an offspring with the genotype

F_1

?

Accepted Answer

Answer

Answer

Answer

Question 5

In a cross between two individuals with genotypes

AaBb

and

rryy

, what proportion of the offspring are expected to be phenotypically dominant for both traits, assuming independent assortment and complete dominance?

Accepted Answer

Answer

Answer

Answer

Question 6

An organism has the genotype

AaBb

. If these two genes are located on different chromosomes, which of the following diagrams best represents the alignment of chromosomes during Metaphase I of meiosis that would lead to the production of

rryy

and

F_1

gametes?

Accepted Answer

One homologous pair with

AaBb

and

rryy

chromatids aligned such that

F_1

faces the same pole as the chromosome carrying

F_1

Answer

A single chromosome containing all four alleles

AaBb

and

rryy

at different loci

Answer

One homologous pair with

AaBb

and

rryy

chromatids aligned such that

F_1

faces the same pole as the chromosome carrying

F_1

Answer

Two homologous pairs where

AaBb

is physically linked to

rryy

on the same DNA molecule

Question 7

In a dihybrid cross involving two genes that assort independently, a researcher crosses a

AaBb

individual with a

rryy

individual. Out of 800 total offspring, approximately how many are expected to show the dominant phenotype for the first trait and the recessive phenotype for the second trait?

Accepted Answer

200

Answer

50

Answer

400

Answer

450

Question 8

In a dihybrid cross between two plants with the genotype

AaBb

, where

rryy

is yellow seeds (dominant),

F_1

is green seeds (recessive),

F_1

is round seeds (dominant), and

WwDd

is wrinkled seeds (recessive), what is the probability that an offspring will have the genotype

wwdd

?

Accepted Answer

Answer

Answer

Answer

Question 9

In a dihybrid cross between two sweet pea plants with the genotypes

AaBb

and

rryy

, where purple flowers (

F_1

) are dominant to white (

F_1

) and yellow seeds (

WwDd

) are dominant to green (

wwdd

), what is the expected ratio of phenotypes in the offspring?

Accepted Answer

3 purple-flowered/yellow-seeded : 3 purple-flowered/green-seeded : 1 white-flowered/yellow-seeded : 1 white-flowered/green-seeded

Answer

1 purple-flowered/yellow-seeded : 1 purple-flowered/green-seeded : 1 white-flowered/yellow-seeded : 1 white-flowered/green-seeded

Answer

3 purple-flowered/yellow-seeded : 1 white-flowered/green-seeded

Answer

9 purple-flowered/yellow-seeded : 3 purple-flowered/green-seeded : 3 white-flowered/yellow-seeded : 1 white-flowered/green-seeded

Question 10

In a genetic cross between a fruit fly that is heterozygous for both vestigial wings (

AaBb

) and ebony body (

rryy

) and a fruit fly that is also heterozygous for both traits (

F_1

), what is the probability that an offspring will show the recessive phenotype for BOTH traits, assuming the genes follow Mendel's Law of Independent Assortment?

Accepted Answer

Answer

Answer

Answer

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