human skin colour is polygenic trait with each dominant determining a part of medium deposition while the recessive are coding for jo melanin. if a very dark skinned person marries a very light skinned women, the chances of a very dark skinned sffspring are?
Answer (1)
Student Expert
28th Feb, 2021
Hello,
That's a biology question from class 12th.
Okay so, Skin colour in humans is due to the presence of the pigment melanin in body . The higher the pigment concentration, the darker is the skin. The black parent has the phenotype for very dark skin and the genotype for dominant alleles AABBCC, while the albino parent has the phenotype for very light skin and the genotype for recessive alleles aabbcc. The F1 generation will show the phenotype for intermediate skin colour and the genotype AaBbCc. When two F1 hybrids with 8 gametes each are crossed, 64 offsprings are produced.In F2 progeny, apart from two parental types, 62 offspring show only 30 genotypes. This indicates that different genotypes produce the same phenotype.
So, the phenotypic ratio is 1 very dark : 6 dark : 15 fairly dark : 20 intermediate : 15 fairly light : 6 light : 1 very light. So, the answer is 1 very dark out of 64 offsprings (1/64).
I hope this helps.
That's a biology question from class 12th.
Okay so, Skin colour in humans is due to the presence of the pigment melanin in body . The higher the pigment concentration, the darker is the skin. The black parent has the phenotype for very dark skin and the genotype for dominant alleles AABBCC, while the albino parent has the phenotype for very light skin and the genotype for recessive alleles aabbcc. The F1 generation will show the phenotype for intermediate skin colour and the genotype AaBbCc. When two F1 hybrids with 8 gametes each are crossed, 64 offsprings are produced.In F2 progeny, apart from two parental types, 62 offspring show only 30 genotypes. This indicates that different genotypes produce the same phenotype.
So, the phenotypic ratio is 1 very dark : 6 dark : 15 fairly dark : 20 intermediate : 15 fairly light : 6 light : 1 very light. So, the answer is 1 very dark out of 64 offsprings (1/64).
I hope this helps.
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