Ch 17: Heredity & Breeding

Which of the following statements about genes is FALSE?

A. Genes are the units by which traits are inherited

B. Genes are made up of amino acids

C. Genes are located in the nucleus

D. Genes are located in chromosomes

B. Genes are made up of amino acids

List the examples of an animal’s phenotype.

Coat color

Eye color

Maternal behavior

Length of intestines

*All other physical characteristics

What are chromosomes made up of?

A. Ribosomes

B. PKU

C. DNA

D. Cytoplasm

C. DNA

Explain what “knockout” means.

An animal that has had a gene “turned off”

Explain what “mutation” means.

An alteration or change in a gene

Explain what “transgenic” means.

An animal that has had new genes inserted

Explain what “DNA” means.

The chemical code that makes up genes

Explain what “trait” means.

An inherited characteristics, such as hair color or height

The time between fertilization and birth is called the _______ period.

Gestation

In a pair of genes, the gene that is more easily expressed is said to be:

A. Overriding

B. Ascendant

C. Recessive

D. Dominant

D. Dominant

Dystocia means _______ birth.

Difficult

The lighting system should provide ____ to ____ hours of light for most rodent breeding colonies.

12 to 14

Vaginal _______ means that a portion of the vaginal tissue is visible outside the body.

Prolapse

The visible spot on the abdomen of a neonatal pup that is nursing well is called a ____ spot.

Milk

List three ways to check for pregnancy in rodents:

Checking for the presence of vaginal mucous plug in female or cage floor

Swab cervix and examine for sperm

Weight monitoring

Radiographs

Gentle palpitations of abdomen

What is the technical term for when a female animal is in “heat?”

Estrus

An animal that has had a functional human gene added to it can be referred to as:

Humanized

List three mating systems.

Monogamous mating

Polygamous

Harem

What is the difference between inbreeding and outbreeding?

Outbreeding uses distantly related or unrelated animals

Inbreeding uses closely related animals