HEREDITY
MONOHYBRID CROSS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
Short hair is dominant to long hair in mice. Determine the genotype and phenotype ratios for a homozygous recessive female and a heterozygous male.
|
|
2:4 SS 2:4 Ss4:4 short hair
|
|
|
2:4 Ss 2:4 ss4:4 long hair
|
|
|
2:4 Ss 2:4 ss2:4 short hair 2:4 long hair
|
|
|
1:4 SS 2:4 Ss 1:4 ss3:4 short hair 1:4 long hair
|
Explanation:
Detailed explanation-1: -AA or Aa mice are agouti. Mice with genotype aa are albino because all pigment production is blocked, regardless of the phenotype at the second locus. At the second locus, the B allele (agouti coat) is dominant to the b allele (black coat).
Detailed explanation-2: -Black hair color is dominant to white hair color in mice.
Detailed explanation-3: -In guinea pigs, short hair (H) is dominant to long hair (h), and the heterozygous condition when you cross a yellow coat (CY) and white coat (CW) gives you a cream coat. These two loci are located on different chromosomes. A heterozygous short-haired cream guinea pig is crossed with a long-haired white guinea pig.
There is 1 question to complete.