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A. Consider a diploid organism such as ourselves. If a phenotype is only present when a...

  1. A. Consider a diploid organism such as ourselves. If a phenotype is only present when a mutation is homozygous, what information does that tell you about the function of the gene that’s mutated and/or how it interacts with other genes?

    B. If a phenotype is present when a mutation is heterozygous, what does that tell you about the function of the gene that’s mutated and/or how it interacts with other genes?
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Answer #1

A. If a phenotype is present only when mutation is homozygous, it means that it is if recessive type and will express when both the allele will be recessive or homozygous recessive in final generation.

So for the gain of function of this trait by gene it will be required that both the allele will be recessive and express together.Such mutations are alike in both maternal and paternal allele.

B. When the mutation is heterozygous in nature, then it will be express. It is also called dominant mutation. When two different mutations are present on paternal and maternal alleles. So when both the parents will be affected then only the offspring will be affected otherwise there will be a maximum of 1/4 probability of getting mutation expression in offspring.

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