Question 1

If a plant is test-crossed which of the following genes are linked? 
A) Flower color and height
B) Flower color and flower placement
C) Flower placement and height
D) None of these genes appear to be linked

Accepted Answer

The answer of If a plant is test-crossed which of...

Question 2

If the progeny of a mating of pea plants have the following ratios 1342 smooth seed/green pod, 447 wrinkled seed/yellow pod, 429 smooth seed/ yellow pod, 1361 wrinkled seed/green pod what are the genotypes of the parents?
A) Parent 1: Homozygous for seed shape and pod color Parent 2: Heterozygous for seed shape and homozygous for pod color
B) Both parents are heterozygous for seed shape and pod color
C) Parent 1: Heterozygous for seed shape and pod color Parent 2: Homozygous seed shape and heterozygous for pod color
D) Parent 1: Heterozygous for both seed shape and pod color Parent 2: Homozygous for both seed shape and pod color

Accepted Answer

To determine the genotypes of the parents, we can use the ratios given in the progeny.

From the ratio of 1342 smooth seed/green pod, we know that one parent must be homozygous for smooth seed and green pod (SSGG).

From the ratio of 447 wrinkled seed/yellow pod, we know that the other parent must be homozygous for wrinkled seed and yellow pod (ssYY).

From the ratio of 429 smooth seed/yellow pod, we know that the second parent must also carry at least one dominant allele for smooth seed (S). This means the second parent must be heterozygous for seed shape (SsYY).

From the ratio of 1361 wrinkled seed/green pod, we know that the first parent must also carry at least one recessive allele for seed shape (s). This means the first parent must be heterozygous for seed shape (SsGG).

Therefore, the best choice is C, as it satisfies all the ratios given in the progeny.

Question 3

Two dihybrid pea plants (both tall and with purple flowers) are mated. The cross resulted in 9866 progeny, of which 5550 were tall with purple flowers. What are the expected ratios of the other phenotypic classes?
A) 1850 Short/white flower 616 Tall/white flower
1850 Short/purple flower
B) 1850 Short/white flower 1850 Tall/white flower
1850 Short/purple flower
C) 616 Short/white flower 1850 Tall/white flower
1850 Short/purple flower
D) 5550 Short/white flower 5550 Tall/white flower
5550 Short/purple flower

Accepted Answer

The answer of Two dihybrid pea plants (both tall and...

Question 4

Two heterozygous plants are bred. The enzyme that controls the phenotype that is being studied is measured in the progeny and represented in the graph below. What are the expected ratios of the different progeny based on their enzyme levels? 
A) A: 33.3% B: 33.3%
C: 33.3%
B) A: 50% B: 25%
C :25%
C) A: 25% B:50%
C: 25%
D) A: 25% B: 25%
C: 50%

Accepted Answer

The answer of Two heterozygous plants are bred. The enzyme...

Quiz 2: Mendelian Inheritance

If a plant is test-crossed which of the following genes are linked?

If the progeny of a mating of pea plants have the following ratios 1342 smooth seed/green pod, 447 wrinkled seed/yellow pod, 429 smooth seed/ yellow pod, 1361 wrinkled seed/green pod what are the genotypes of the parents?

Two dihybrid pea plants (both tall and with purple flowers) are mated. The cross resulted in 9866 progeny, of which 5550 were tall with purple flowers. What are the expected ratios of the other phenotypic classes?

Two heterozygous plants are bred. The enzyme that controls the phenotype that is being studied is measured in the progeny and represented in the graph below. What are the expected ratios of the different progeny based on their enzyme levels?