Question

Which of the following is an incorrect statement about the inheritance of the ability to taste the chemical PTC (phenylthiocarbamide)?
A) The ability to taste PTC follows Mendelian
patterns of inheritance.
B) Any child born of parents who are able to taste PTC will inherit the ability to taste PTC.
C) Two children of taster parents can inherit opposite PTC-tasting phenotypes.
D) The non-taster phenotype is a recessive trait.
E) The inheritance pattern of PTC tasting differs from the inheritance pattern of hairline contour (widow's peak).

Answer 1

Answer:

B) Any child born of parents who are able to taste PTC will inherit the ability to taste PTC.

Explanation:

The ability to taste the chemical PTC (phenylthiocarbamide) contain some people who can and some people who cannot taste PTC. Despite the fact, this trait is often considered a simple Mendelian trait, i.e.one gene-two alleles.(a simple genetic trait governed by a pair of alleles).The reason why this trait has been kept going in the population is undetermined but polymorphism may influence food selection or nutritional status.

If we have two parents that are heterozygous for this PTC traits, if the cross, they will have the following types of offspring.

Let say; dominant T for tasting and recessive t for nontasting----   i.e   Tt

If Tt crosses with Tt,  we have;

                    T                     t  

T                   TT                   Tt

t                     Tt                    tt

From the punnet square, we have the following offspring

TT (dominant  PTC taster )

2 Tt ( heterozygous PTC taster)

tt (recessive Non- taster)

From, the foregoing, we can clearly see that the incorrect statement about the  inheritance of the ability to taste the chemical PTC (phenylthiocarbamide) is Any child born of parents who are able to taste PTC will inherit the ability to taste PTC. This is because from the cross, it is not all children that inherit the ability to taste PTC.