Question

In humans, the ability to taste the chemical PTC is inherited as a single gene dominant trait represented by the allele T. A couple who are both tasters have four children, one of which is a non taster.
Which of the following best predicts what genotypes the parents of these children possess?
a. Both parents are homozygous dominant for the taster trait ( TT)
b. One parent is homozygous dominant (TT) and other is heterozygous (Tt)
c. One parent is homozygous recessive (tt) and the other parent is heterozygous (Tt)
d. One parent is homozygous dominant (TT) and other is homozygous recessive (tt)
e. Both parents are heterozygous (Tt)

Answer 1

Hint: Genetic inheritance is a fundamental precept of genetics and explains how traits are handed from one generation to the subsequent. It is a fundamental concept where the genetic inheritance takes place due to genetic alleles, inside the form of DNA, which are being handed from dad and mom to their offspring.

Complete answer:
• T is the dominant trait where when T allele is inherited it shows dominance and its phenotype can be seen in the offspring
• Whereas when the only t is inherited it produce recessive phenotype and shows intolerance to the taste
• So for the correct recombination where among the four offspring one shows the quality of non-taster, both the parent should be Tt
• When the parent is heterozygous law of segregation occurs where all the alleles get independent assorted
• Then these independent alleles come and recombine to form offspring
• This offspring formation occurs when fertilisation occurs
• Then T,t, T,t recombine and produces four offspring where the alleles formation genotype is formed as TT, Tt, Tt, tt
• Here TT, Tt, Tt will show dominance whereas that shows non-taster quality as tt don’t have T dominant allele.
• When organisms reproduce, all the records for boom, survival, and reproduction for the next generation is determined inside the DNA exceeded down from the discern generation.

Hence, the correct answer is option (E).

Note: Mendel’s work has been closely constructed over the past one hundred fifty years and the field of genetics has come a long way for the reason that his pea experiments. His main two laws were law of Segregation where the alleles for each individual segregate at some stage in gamete manufacturing so that each gamete will simplest have one of the two alleles for each gene and Law of Independent Assortment where pairs of alleles for each feature/gene segregate independently of every other.