20 - Beyond Mendel

Question 1

Incomplete dominance

Answer 1

when neither of two alleles in a gene pair completely dominates the other

Question 2

co-dominance

Answer 2

the situation in which the phenotypes of both alleles are exhibited in the heterozygote because both alleles affect the phenotype in separate, distinguishable ways.

Question 3

Multiple alleles

Answer 3

refer to the presence of more than two alternative forms of a gene that can exist at a particular genetic locus

Question 4

Epistasis

Answer 4

A type of gene interaction in which the phenotypic expression of one gene alters that of another independently inherited gene

Question 5

Melanin

Answer 5

is a natural pigment found in most organisms, responsible for the color of skin, hair, and eyes in humans and other animals

Question 6

Melanosome

Answer 6

is an organelle found within melanocytes, the cells responsible for producing melanin. Melanosomes are the site of melanin synthesis, storage, and transport.

Question 7

Melanocyte

Answer 7

is a specialized cell responsible for the production of melanin, the pigment that gives color to the skin, hair, and eyes.

Question 8

Pleiotropy

Answer 8

the ability of a single gene to have multiple effects

Question 9

Polygenic inheritance

Answer 9

An additive effect of two or more genes on a single phenotypic character