Question

What are the controlled by a siogle gene called?
Explain with an example why its phenotypi'e ratio is
2:1 instead of 3:1?​

Answer 1

Answer:

1.The majority of human genes are thought to have more than two normal versions or alleles. Traits controlled by a single gene with more than two alleles are called multiple allele traits.

2.In Pleiotropy the ratio is 2 : 1 instead of 3 : 1. For example, the disease, sickle-cell anaemia, is caused by a gene HbS. Normal or healthy gene HbA, is dominant. ... Thus the gene for sickle-cell anaemia is lethal in homozygous condition and produces sickle-cell trait in heterozygous carrier.

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Answer 2

Answer:

In a typical monohybrid cross, F

2

population ratio is written as 3: 1 for phenotype but expressed as 1: 2: 1 for genotype. Explain with the help of an example.

Explanation:

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