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Genetics

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Set 3 Extensions To Mendels Laws

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Question 1

(Multiple Choice)

Free
A particular flower can be purple, blue, red, or white.Two different pure-breeding white plants are crossed and the F1 are then crossed to produce an F2 generation.What might a 9:7 phenotypic ratio in the F2 indicate?

A)reciprocal recessive epistasis
B)codominance
C)dominant epistasis
D)recessive lethality
E)additivity

Answer

Question 2

(Multiple Choice)

Free
A particular flower can be purple, blue, red, or white.A pure-breeding red plant is crossed with a pure-breeding white one, and the F1 are then crossed to produce an F2 generation.Which of the following phenotypic ratios in the F2 indicate that flower color in these plants is controlled by two genes?

A)2:1
B)3:1
C)1:2:1
D)9:3:4

Answer

Question 3

(Multiple Choice)

Free
What genetic phenomenon might a 2:1 phenotypic ratio indicate?

A)additivity
B)codominance
C)complete dominance
D)recessive epistasis
E)recessive lethal

Answer