Question

The following two genotypes are crossed: Aa Bb Cc dd Ee × Aa bb Cc Dd...

The following two genotypes are crossed: Aa Bb Cc dd Ee × Aa bb Cc Dd Ee. The proportion of the offspring that are expected to be aa bb Cc Dd Ee assuming Mendelian inheritance is ___.

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Answer #1

Answer is 1/64.

Explanation:

Let P​​​​​​1: Aa Bb Cc dd Ee and

P​​​​​​2: Aa bb Cc Dd Ee

The total number of gene pairs that can be formed by taking one gene from every pair = 210

This number includes repeating genotypes.

Now aa bb Cc Dd Ee can be formed by -

a from P​​​​​​1 and a from P​​​​​​2 (only 1 choice)

b from P​​​​​​1 and b from P​​​​​​2 (2 choices as there are 2 b in P​​​​​​2)

(C from P​​​​​​1 and c from P​​​​​​2 ) or ( c from P​​​​​​1 and C from P2)

(2 choices)

d from P1 and D from P2 ( 2 choices as P1 has 2 d)

(E from P1 and e from P2) or (e from P1 and E from P2)

(2 choices)

Therefore total number of choices to form it = 1×2×2×2×2 = 24

Hence, proportion =

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