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If husband is PTC taster and wife is PTC...

If husband is PTC taster and wife is PTC non taster. Their daughters are non tasters but their son is taster. This is not related with a sex-linked trait. Out of four a, b, c, d which pedigree is correct

A

B

C

D

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze the genetic inheritance of the PTC tasting trait based on the information given. Here’s a step-by-step breakdown: ### Step 1: Understand the Traits - PTC tasting is determined by the presence of the dominant allele (T). - The non-taster allele is recessive (t). - Therefore, a person who is a taster can have the genotype TT (homozygous dominant) or Tt (heterozygous), while a non-taster must have the genotype tt (homozygous recessive). ### Step 2: Analyze the Parents - The husband is a PTC taster. His possible genotypes are either TT or Tt. - The wife is a PTC non-taster, which means her genotype must be tt. ### Step 3: Determine the Offspring Genotypes - If the husband is TT (homozygous), all offspring will inherit a T allele from him and a t allele from the mother, resulting in all children being Tt (tasters). - If the husband is Tt (heterozygous), the possible offspring genotypes would be: - 50% Tt (tasters) - 50% tt (non-tasters) ### Step 4: Analyze the Daughters and Son - The daughters are non-tasters (tt), which indicates that the husband must be Tt (heterozygous), as a TT father would not produce any non-taster daughters. - The son is a taster (Tt), which is consistent with the father being Tt. ### Step 5: Construct the Pedigree - The pedigree must reflect that the father is Tt (taster) and the mother is tt (non-taster). - The daughters are tt (non-tasters), and the son is Tt (taster). ### Step 6: Identify the Correct Pedigree - Among the options (A, B, C, D), we need to find the one that accurately represents the genotypes: - The father (Tt) should have non-taster daughters (tt) and a taster son (Tt). ### Conclusion - After analyzing the information, the correct pedigree is option D, which shows the father as a taster (Tt), the mother as a non-taster (tt), the daughters as non-tasters (tt), and the son as a taster (Tt). ---
To solve the problem, we need to analyze the genetic inheritance of the PTC tasting trait based on the information given. Here’s a step-by-step breakdown: ### Step 1: Understand the Traits - PTC tasting is determined by the presence of the dominant allele (T). - The non-taster allele is recessive (t). - Therefore, a person who is a taster can have the genotype TT (homozygous dominant) or Tt (heterozygous), while a non-taster must have the genotype tt (homozygous recessive). ### Step 2: Analyze the Parents ...
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