Chapter 17 - Heredity & Breeding Flashcards
What are the units of genetic inheritance?
Genes
Genes are located on chromosomes and are made up of a chemical called _____.
deoxyribonucleic acid (DNA)
Long strings of double-stranded DNA form _____.
chromosomes
An inherited characteristic, such as fur color, is called a _____.
trait
True or False
A gene that easily expresses the trait of an animal is said to be recessive.
False
The trait is said to be dominant.
What is a transgenic animal?
An animal that contains genetic material from a different source.
What is the term for a damaged or changed gene?
Mutation
What is the period from conception to parturition called?
Gestation
What does finding a vaginal plug in a female mouse mean?
Evidence of mating within the previous 24 hours.
In what breeding scheme are unrelated or distantly related animals mated?
Outbreeding
In a monogamous mating scheme, how many males and how many females are put together in a cage?
One male and one female.
An inbred strain is achieved after a minimum of how many generations of brother-to-sister or parent-to-offspring breedings?
20 generations
What is another name for a polygamous mating system in which one male is housed with two or more females?
Harem mating system
What is a milk spot on a neonatal rodent?
A distinct white spot visible on left side of the abdomen of newborn rats and mice indicating the stomach contains milk.
What is the term for difficult labor or birthing?
Dystocia
