Question

You are given a red flower bearing pea plant and a red flower bearing snapdragon plant.How would you find the genotype of these two plants with (the help of crosses)respect to the colour of flower.

Answer 1

Inheritance of flower colour in pea plant - Pisum sativum

Parent RR x rr

(Red) (White)

Gamete Rr

F1 Rr (Red)

This inheritance pattern follows law of dominance, that is between the two alleles

of the flower colour (gene) the dominant allele is expressed( phenotypically), over

the recessive.

In the case of Antirrhinum(snap dragon) the dominant flower colour is red. White

in recessive.

Parent RR x rr

(Red) (white)

Gamete R r

F1 R r (Pink)

This is the case of incomplete dominance; it is because the allele for red colour is

not completely dominant over its recessive allele, law of dominance not exhibited.