A pea plant is the F1 offspring of a true-breeding plant with purple flowers and a true-breeding plant with white flowers. This plant is crossed with one that has white flowers (recessive). What percentage of plants in the next generation will likely have white flowers?

Question

Marcos Hammond

Mathematics

12 August, 14:23

A pea plant is the F1 offspring of a true-breeding plant with purple flowers and a true-breeding plant with white flowers. This plant is crossed with one that has white flowers (recessive). What percentage of plants in the next generation will likely have white flowers?

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Wilkinson · Answer 1

Answer: Percentage of 50% of being white.

Step-by-step explanation: Since white is recessive, it means its allele is w. So, purble must be dominant with allele W.

The parents of the F1 offspring are true-breed, which mean they are homozygous dominant (WW) or homozygous recessive (ww). From this crossing (WW x ww), the F1's genotype is Ww.

This plant is crossed with one with white flower, which means the crossing is between Ww and ww.

From the crossing Ww x ww, we have generation F2 as:

w w

W Ww Ww

w ww ww

Or in other words, we have 2 chances out of 4 of having white, because, since this characteristics is recessive it only shows when the allele is doubled (ww).

So, the percentage of having white is 50%.