Chapter 17: Heredity And Breeding

Question 1

What are the long, paired structures made of DNA and protein found in the nucleus called?

Answer 1

Chromosomes

Question 2

What are chromosomes made up of?

Answer 2

DNA

Question 3

What is the chemical code that makes up genes?

Answer 3

DNA

Question 4

What is an animal that has had a gene “turned off”

Answer 4

Knockout

Question 5

What is an alteration or change in a gene

Answer 5

Mutation

Question 6

What is an animal that has had new genes inserted

Answer 6

Transgenic

Question 7

What is an inherited characteristic, such as hair color or height

Answer 7

Trait

Question 8

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

Answer 8

Gestation

Question 9

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

Answer 9

Dominant

Question 10

Dystocia means _______ birth.

Answer 10

Difficult

Question 11

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

Answer 11

12 to 14

Question 12

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

Answer 12

Prolapse

Question 13

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

Answer 13

Milk

Question 14

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

Answer 14

Estrus

Question 15

List three ways to check for pregnancy in rodents

Answer 15

1- vaginal mucous plug
2- swab the cervix and look for sperm
3- gentle palpation of abdomen

Question 16

True or False

You can always tell an animal’s genotype by its physical traits

Answer 16

False

Question 17

Name three mating systems

Answer 17

1- monogamous
2- polygamous
3- harem

Question 18

What is the difference between inbreeding and outbreeding

Answer 18

Outbreeding used distantly related or unrelated animals; inbreeding uses closely related animals