Question

In a cross between negro and albino skin colour of humans showing polygenic inheritance, the phenotypic ratio in F2 generation will be

Answer 1

Answer:

bskabsvzbajvxcxbxmxbxv

Answer 2

Answer:

1:6:15:20:15:6:1

Explanation:

If AABBCC are Negro and aabbcc are Albino,

in F1 the result of the cross will be AaBbCc

Now the gametes taking part in crossing are

ABC , ABc , AbC, Abc , aBC, abC , aBc, abc( 8 possibilities)

Hence when the gametes undergo fertilization we get 8×8 = 64 types of skin coloured humans .

Now let's add the ratios .

a) 9+3+3+1=16

b) 1+6+15+20+15+6+1=64

c) 1+4+6+4+1=15

d) 1+2+2+4+1+2+1+2+1=16

As we are getting 64 possibilities in option b ,

b) is the right answer:)