Genetics Review

Two identical alleles for a trait is known as

• homozygous

• heterozygous

• mutation

• codominance

A physical appearance is

• genotype

• heterozygous

• phenotype

• codominance

Who studied different characteristics of pea plants by cross-pollinating plants?

• Gregor Mendel

• Albert Punnett

• Sir Isaac Newton

• David Kuster

What does a Punnett Square determine?

• all of Mendel's discoveries about genetic crosses

• all the outcomes of a genetic cross

• only the recessive allele combinations

• only the dominant allele combinations

Genotype is

• stem height

• feather color

• physical appearance

• genetic makeup

Factors that control traits are

• purebreds

• genes

• recessives

• parents

A mutation is

• any change that is harmful

• any change in a gene or chromosome

• any change that is helpful

• any change in the phenotype

An organisms's allele combination is known as

• phenotype

• mutation

• hybrid

• genotype

If a homozygous black cat (BB) is crossed with a homozygous white cat (bb), what is the probability of having a cat with white fur?

• 100%

• 0%

• 75%

• 25%

What does RR mean

• two dominant alleles

• heterozygous alleles

• at least one dominant allele

• one dominant and one recessive allele