Answer:
9:3:3:1
Explanation:
In the given question, the two genes are unlinked which are controlled by dominant and recessive allele.
<u>Trait- Ear curling</u>
1. Curled ears- C, genotype will be- CC or Cc
2. Normal ears-c, genotype will be- cc
<u>Trait- color</u>
1. Black colour- B,genotype will be- BB or Bb
2. Grey colour- b, genotype will be- bb
Now, if cross between heterozygote will be performed
CcBb x CcBb
then allele will be CB, Cb, cB and cb
Now punnett square cross will be-
M/F CB Cb cB cb
CB CCBB CCBb CCBb CcBb
Cb CCBb CCbb CcBb Ccbb
cB CcBb Ccbb ccBb ccBb
cb CcBb Ccbb ccBb ccbb
On the basis of this phenotypic ratio will be-
- 9 black and curled
- 3 black not curled
- 3 brown and curled
- 1 brown and not curled
Thus, 9:3:3:1 is correct.