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describe Understanding mutation of alleles

Gene A encodes a receptor tyrosine kinase Gene B encodes a G-protein coupled receptor. All of these genes has mutant alleles that are structurally normal however lack activity in their cytoplasmic domains.

a) describe what activity does the cytoplasmic domain of a receptor tyrosine kinase normally have?

b) describe what activity does the cytoplasmic domain of a G-protein-coupled receptor normally have?

c) describe is heterozygosity for the mutant allele of gene A or gene B likely to be more serious and Why?

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