what will be the genotypic ratio of f2 generation if 120 flower are purple and 30 flower are white colour
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Answered by
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
0
The genotypic ratio of this cross will be 1:2:1.
Explanation:
- 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.
- 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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