In garden peas, tall stem (T) is dominant over short stem (t), green pods (G) ar

Question

In garden peas, tall stem (T) is dominant over short stem (t), green pods (G) are dominant over yellow pods (g), and smooth seeds (S) are dominant over wrinkled seeds (s). Suppose a homozygous short, green, wrinkled pea plant is crossed with a homozygous tall, yellow, smooth one.

a) What will be the appearance of the F1 generation?
b) If the F1 plants are interbred, what will be the appearance of the F2 generation?
c) What will be the appearance of the offspring of a cross of the F1 back to the short, green, wrinkled parent?
d) What will be the appearance of the offspring of a cross of the F1 back to the tall, yellow, smooth parent?

Explanation / Answer

In garden peas, tall stem (T) is dominant over short stem (t), green pods (G) are dominant over yellow pods (g), and smooth seeds (S) are dominant over wrinkled seeds (s).

Suppose a homozygous short, green, wrinkled pea plant-------------ttssGG

is crossed with a homozygous tall, yellow, smooth one. ---------------- TTggSS

a) What will be the appearance of the F1 generation?

TtGgSs---------------TALL, GREEN,SMOOTH

b) If the F1 plants are interbred, what will be the appearance of the F2 generation?

TtGgSs X TtGgSs

27:9:9:9:3:3:3:1

c) What will be the appearance of the offspring of a cross of the F1 back to the short, green, wrinkled parent?

TtGgSs---------------TALL, GREEN,SMOOTH X tt ssGG

RATIO =1:1:1:1:1:1:1:1

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