Question

In a pea plant, the trait of flowers bearing purple colour (PP) is dominant over white

colour (pp). Explain the inheritance pattern of F1 and F2 generations with the help of a

cross following the rules of inheritance of traits. State the visible characters of F1and F2

progenies​

Answer 1

Answer:

The above inheritance cross is called a monohybrid cross, which was proposed by Mendel. It refers to the genetic cross that takes place between the individuals that have homozygous genotypes. One of the homozygous parents displays dominant alleles, whereas the other parent displays recessives genes.

The F1 and F2 inheritance patterns and the color distribution for such a cross has been shown below:

Answer 2

Explanation:

The cross that is mentioned here is a simple Mendelian monohybrid cross where the selected character is the flower colour.

The dominant allele = purple colour = P

The recessive allele = white colour = p

So, the genotype of parental generation = PP and pp

So, the genotype of the $1^{st}$ filial generation = Pp, as both the characters segregate and come to each progeny in equal proportions.

The genotype of the gametes of F1 generation = P P p p

So, each can combine to produce four probable combinations where the 2nd and 3rd combination is the same. So, the final F2 genotype = PP Pp and pp

The ratio of the genotypes of the $2^{nd}$ filial generation = 1 : 2 : 1