Which of the following is the most likely description of a trait which shows up rarely in a family tree equally in both sexes and only aftert a consanguineous mating?
a. recessive autosomal
b. dominant autosomal
c. x-linked
d. y-linked
e. either x or y-linked

The correct answer will be option-A

Explanation:

In the pedigree analysis, the description of a trait help shows the relation of a trait linked to a gene.

The pedigree analysis is usually used to determine the heredity of a disease in a family which has been described in the question also as

1. The trait is rare and present in both sexes- this shows that it is independent of sex chromosomes and since is rare is recessive.

2.  A consanguineous mating- mating between close relative which result in autosomal recessive trait as the genes for the trait must be present on both the parents which happen only when they are closely related.

Thus, option-A is the correct answer.