Question

F1 progeny of pea plant bearing violet flowers and snap dragon bearing red flowers were selfed to produce their respective f2progeny.Compare the phenotypes,genotypes and the pattern of inheritance

Answer 1

Answer:

phenotype ratio is 1:2:1 .genotype ratio is 1:2:1 .pattern of inheritance is incomplete dominance .

Answer 2

F2 generation of red flowers in snapdragon will have the phenotype of red flowers and genotype of RR. The pattern of inheritance is complete dominance.

F2 generation of violet flowers in snapdragon will have the phenotype of violet flowers and white flowers and genotype of Rr, rr. The pattern of inheritance is complete dominance.

Explanation:

Red colour in the snapdragon flower shows incomplete dominance if crossed with white colour flower the genotype Rr is pink colour in it. So it will have RR as genotype. When self pollination:

   R    R

R   RR  RR    Genotype 4:0, phenotype all red

R  RR   RR

Violet genotype is Rr, violet is dominant trait. When selfed in F2 generation

 R   r

R RR rR       Genotype ratio 1:2:1,   phenotype 3:1  (3 violet, 1 white)

r  Rr  rr

The pattern of inheritance is complete dominance. The dominant allele is expressed and recessive allele is suppressed in both the case. The phenotype is of dominant allele.

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