If several pea plants with the genotype ttyy are crossed with pea plants with the genotype ttyy what percentage of the offspring will be expected to have the ttyy allele combination

25%

Explanation:

A cross between two heterozygous plant can will result in the following pair.

To get this combination we need to cross the first pair individually and then the second pair individually.

    T         T                        Y         y

T   TT     TT                   y   Yy     yy

t    Tt       Tt                   y   Yy      yy

The ratio of TT= 1/2        The ratio of Yy= 1/2

The total ratio of TTYy= 1/2* 1/2 = 1/4 which is 25% of the total offspring produced by the cross between the pair TTYy and  Ttyy.

The offspring produced is heterozygous.

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