Biology, asked by shalubcs20gmailcom, 6 hours ago

what will be the genotypic ratio of f2 generation if 120 flower are purple and 30 flower are white colour​

Answers

Answered by XxitztoxicgirlxX
0

Answer:

Since the F

2

generation ratio of red and white colour flower is 60:20 (3:1), the allele for red flower is completely dominant over that of white colour flower. If the red flower allele is denoted by R and that of white colour is denoted by r, the genotype of heterozygous red flowered plant will be Rr. This heterozygous red flowered plant will produce two types of gametes R and r. Selfing of heterozygous red flowered plants produce red and white colour flowers in 3:1 ratio. Option A (72:24) also show the same ratio. Hence, the correct option is A.

Gametes :

Rr --->

Rr R r

R RR

red Rr

red

r Rr

red rr

white

Answered by mitu890
0

The genotypic ratio of this cross will be 1:2:1.

Explanation:

  1. The f2 generation have 120 flowers as purple and 30 flowers as white which gives us that purple is the dominant trait in the family.
  2. Now, the genotypic ratio is :
  • As in the cross with single trait the genotypic ratio of f2 generation is 1:2:1.
  • So according to this ratio the genotypic ratio of the given cross is 30:60:30.
  • But we have 150 in total flowers which means there is some deviation present, thus cannot be answered correctly.
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