Intro to mendelian genetics (NOT DONE)

EXAM #3

The result from Gregor mendel’s remarkable crossing (mating) experiments form the basis of genetic science.

True

Which model system did Gregor Mendel select to facilitate his investigation of heredity?

Pea

A species that researchers intentionally choose to facilitate the research process is known as a—

model system

Due to spindle (M phase) checkpoint failure, which error can occur during meiosis l or meiosis ll that results in aneuploid gametes?

Nondisjunction

A recessive, loss of function, mutation on the X chromosome causes a dominant phenotype in males because males have—

1 X chromosome

The homozygous female parent horse produces white hair, and the homozygous male parent horse produces dark brown hair. This heterozygous colt produces light brown hair. This is an example of—

incomplete dominance

The red blood cells of heterozygotes with the A alle & B allele at the ABO gene express both glycoprotein A & glycoprotein B on their surface. This is an example of

Co-dominance

The mutated allele that causes cystic fibrosis causes digestive problems, ling damage, thick mucous, and increases the risk of infection. This mutated allele is—

Pleiotropic

define pleiotropic 

single gene that influences multiple, seemingly unrelated phenotypic traits

What is the source of new alleles in a population?

Mutation 

How do populations of an animal species, which inhabit different regions, benefit from having different allele for many genes?

Adaptation to local environmental conditions

In most animal, fungal, plant, and protistan populations, most genes typically have—

> 3 alleles

Two parents with the aa genotype have a child with the achondroplasia genotupe (Aa). How is this possible?

Mutation during meiosis in one parent

All the F1 offspring produced from the testcross experiment express the dominant phenotype. What is the unknown genotype of the parent of interest?

Homozygous dominant (PP)

A trait is unexpressed in the phenotype of the previous generation. This trait is expressed in the phenotype of the next generation. This trait is—

Recessive

A mutation that causes a muscle disorder in humans is not in the nuclear genome. This mutation must be in a gene in the—

Mitochondrion

In your cells, which organelles contain genes?

Mitochondrion & Nucleus