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Q.

A cross between two true breeding lines one with dark blue flowers and one with bright white flowers produces F1 offspring that are light blue. When the F1 progeny are selfed,  1 : 2 : 1 ratio  of dark blue to light blue to white flowers is observed. What genetic phenomenon is consistent with these results ?

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a

Inbreeding depression

b

Incomplete dominance

c

Co-dominance

d

Epistasis

answer is B.

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Detailed Solution

A cross between two true breeding lines one with dark blue flowers and one with bright white flowers produces F1 offspring that are light blue. When the F1 progeny are selfed,  1: 2 : 1 ratio of dark blue to light blue to white flowers is observed due to incomplete  dominance.

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