Chapter 21: Genetic Inheritance

Question 1

What is a genotype?

Answer 1

specific genes for a trait. represent them with capital and lowercase letters.

Question 2

What are alleles?

Answer 2

versions of a gene

Question 3

What are the two types of alleles?

Answer 3

dominant and recessive

Question 4

Name two types of homozygous genotypes.

Answer 4

homozygous dominant and homozygous recessive

Question 5

What is a phenotype and what are some examples?

Answer 5

physical expression of the genotype. ex: freckles, widows peak, unattached earlobes.

Question 6

What is the genotypic and phenotypic ratio of crossing Ff X Ff?

Answer 6

1:2:1 genotypic, 3:1 phenotypic ratio

Question 7

What is polygenic inheritance?

Answer 7

2 or more genes control one trait

Question 8

Incomplete Dominance:

Answer 8

An intermediate trait, ex curly hair (CC) and straight hair (cc) make wavy hair (Cc)

Question 9

Codominance:

Answer 9

both alleles are equally expressed in a heterozygote. ex: blood type AA and blood type BB produced blood type AB

Question 10

What is sex linked inheritance?

Answer 10

traits are controlled by genes on the sex chromosomes