# A plant can produce either purple flowers or white flowers. What is the probability of purple-flowered offspring if two plants that are heterozygous for purple flowers are crossed?

Mar 6, 2018

By crossing two plants that are heterozygous for purple flowers, there is probability of 75% of the offsprings bearing purple flowers

#### Explanation:

Let us consider a cross between two plants heterozygous for purple flowers.

Heterozygous Purple (Pp) X Heterozygous Purple (Pp)

Each plant will produce two types of gametes, i.e. 50% gametes carrying (P) allele and 50 % carrying (p) allele.

Checking the probability of fusion between the gametes produced by two plants crossed using Punnet Square method, it is seen that 75% plants will have at least one dominant allele (P) and thus will bear purple flowers. Only 25% plants will have recessive allele in homozygous state (pp). These plants will bear white flowers.

Out of 75% plants bearing purple flowers, 25% will be homozygous Purple (PP) and 50% will be heterozygous purple (Pp)