Question 1

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 2

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 3

Two purebred 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 purebred plants are bred. The enzyme...

Question 4

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

The ratio of smooth seed to wrinkled seed in the progeny is approximately 3:1, which suggests that one of the parents is homozygous dominant for seed shape (SS) and the other is heterozygous (Ss). The ratio of green pod to yellow pod in the progeny is approximately 3:1, which suggests that one of the parents is homozygous dominant for pod color (GG) and the other is heterozygous (Gg).

From the given ratios, we can determine the number of each genotype in the progeny:

1342 smooth seed/green pod = 3/4 SS (smooth seed) : 1/4 ss (wrinkled seed) x 3/4 GG (green pod) : 1/4 gg (yellow pod)

447 wrinkled seed/yellow pod = 1/4 SS : 3/4 ss x 1/4 gg : 3/4 GG

429 smooth seed/yellow pod = 1/2 SS : 1/2 ss x 1/4 gg : 3/4 GG

1361 wrinkled seed/green pod = 1/2 SS : 1/2 ss x 3/4 GG : 1/4 gg

Solving for the unknowns, we find that one parent must be SsGg (heterozygous for both traits) and the other must be SSGg (heterozygous for pod color and homozygous dominant for seed shape).

Therefore, the correct answer is C.

Question 5

Huntington's Disease is a fatal syndrome caused by a mutation in the HD gene. The disease has an average age of onset of 35 and the majority of individuals that are affected are heterozygotes. What is the probability that a 25 year old woman with no symptoms and who is the daughter of a man that has HD and a mother who does not will have a child that will have the mutant HD allele?
A)25%
B)50%
C)75%
D)100%

Accepted Answer

The answer of Huntington's Disease is a fatal syndrome caused...

Quiz 2: Mendelian Inheritance

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?

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

Two purebred 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?

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?