The family tree shows the inheritance of the ability to taste a certain substance. The allele for the ability to taste this substance is dominant to the allele for the inability to taste it. What percentage of children of Pasha and Hina would be 'non-tasters'?
Correct answer: A. 25%
- A. 25%
- B. 50%
- C. 75%
- D. 100%
Explanation
The ability to taste the substance is dominant (T) and the inability to taste is recessive (t). If Pasha and Hina are both heterozygous (Tt), their children can have the following genotypes: TT → tasterTt → taster tT → taster (same as Tt)tt → non-tasterThe genotype ratio is 1 TT : 2 Tt : 1 tt, so the phenotype ratio is 3 tasters : 1 non-taster.Percentage of non-tasters: 25%.Conclusion: 25% of Pasha and Hina's children are expected to be non-tasters.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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