Question

Which of the following is an example of a non-Mendelian pattern of inheritance? A. All traits are inherited through patterns found by Mendel.
B. When individuals with the genotype BB cross, all of the offspring have brown fur.

C. When pea plants that are heterozygous for a certain trait cross, some of the offspring express both distinct versions of the trait.

D. Human feet come in a wide range of sizes.

Answer 1

Answer: The correct answer is-

D. Human feet come in a wide range of sizes.

According to Mendelian pattern of inheritance, a trait or physical characteristic of an organism is governed by single gene loci.

In other words, a single gene that exist in two alternative forms (alleles that are dominant and recessive allele) depicts a particular trait (such as tall and dwarf height of pea plant).

In the given option D), the wide range of sizes of human feet depicts polygenic trait (as it shows variation) that it is controlled by more than two genes (unlike Mendelian inheritance, which is controlled by single gene).

Thus, option D) is an example of Non - Mendelian pattern of inheritance.

Answer 2

D: Human feet come in a wide range of sizes. There isn't a lot of gray area or space for ranges of things in medel's laws, but they still work in a lot of cases.