Course

Genetics

Study Pack

Set 24 Quantitative Genetics

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Question 1

(Multiple Choice)

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Use the following to answer questions
The height of a type of bean plant is determined by five unlinked genes called A, B, C, D, and E. Each gene has two alleles: additive (uppercase letter) and nonadditive (lowercase letter). The shortest plants are 130 cm. The tallest plants are 220 cm. The genotypes are known for two bean plants. Plant 1 is genotype AABbccDdEE. Plant 2 is genotype aaBBCcDdEE.
-Estimate how many centimeters each allele contributes to the height difference of 90 cm.

A) 8 cm
B) 9 cm
C) 11.25 cm
D) 22.5 cm
E) 55 cm

Answer

Question 2

(Multiple Choice)

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Use the following to answer questions
The height of a type of bean plant is determined by five unlinked genes called A, B, C, D, and E. Each gene has two alleles: additive (uppercase letter) and nonadditive (lowercase letter). The shortest plants are 130 cm. The tallest plants are 220 cm. The genotypes are known for two bean plants. Plant 1 is genotype AABbccDdEE. Plant 2 is genotype aaBBCcDdEE.
-What are their heights?

A) 9 cm
B) 54 cm
C) 130 cm
D) 184 cm
E) 202 cm

Answer

Question 3

(Multiple Choice)

Free
Flower diameter in sunflowers is a quantitative trait. A plant with 6-cm flowers, from a highly inbred strain, is crossed to a plant with 30-cm flowers, also from a highly inbred strain. The F1 have 18-cm flowers. F1 × F1 crosses yield F2 plants with flowers ranging from 6 to 30 cm in diameter, in approximately 4-cm intervals (6, 10, 14, 18, 22, 26, 30). An 18-cm F1 plant is crossed to a 6-cm plant. What is the probability of an offspring with one additive allele, if all genes that influence this trait are unlinked?

A) 1/3
B) 1/4
C) 1/6
D) 3/8
E) 1/16

Answer