Snapdragons with red, normally shaped flowers are mated with plants with white,

Question

Snapdragons with red, normally shaped flowers are mated with plants with white, abnormally shaped flowers. In the F1, all the flowers are pink and have normal shape. The F1 intercross yields the following F2:

3/16

red, normal

6/16

pink, normal

3/16

white, normal

2/16

pink, abnormal

1/16

red, abnormal

1/16

white, abnormal

a) What are the parental genotypes?

      

b) What are the F2 genotypes and phenotypes?

c) What conclusions can be made about the allelic and gene interactions?

3/16

red, normal

6/16

pink, normal

3/16

white, normal

2/16

pink, abnormal

1/16

red, abnormal

1/16

white, abnormal

Explanation / Answer

The question is not clear but find your answers here

a)

F1 genotypes:

Parents : RN (red, normal) x rn (white abnormal)

The F1 offspring are pink and normal. The genotype is RrNn

RrNn x RrNn

The F2 offspring:

3/16 - red, normal; 6/16 -pink, normal; 3/16 - white, normal; 2/16 - pink, abnormal; 1/16 - red, abnormal and 1/16 white abnormal

The genes segregate independently and show incomplete dominance producing the offspring in 1:2:1 ratio.

male/female RN rn rN Rn RN RRNN RrNn RrNN RRNn rn RrNn rrnn rrNn Rrnn rN RrNN rrNn rrNN RrNn Rn RRNn Rrnn RrNn RRnn

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