Chapter 3 Heredity Review (L1-2)

What does the notation tt mean to geneticists?

• two dominant alleles

• heterozygous alleles

• at least one dominant allele

• two recessive alleles

Is “Ww” a phenotype or a genotype?

• genotype

• phenotype

Is brown eye color a phenotype or a genotype?

• genotype

• phenotype

What is the probability of producing a tall pea plant from a genetic cross between two hybrid tall pea plants?

• 1/4

• 2/4

• 3/4

• 4/4

Which term refers to physical characteristics that are studied in genetics?

• traits

• offspring

• generations

• hybrids

An organism’s genotype is its

• genetic makeup

• feather color

• physical appearance

• stem height

A(n) ____________________ organism is the offspring of many generations and has a homozygous genotype of many traits.

• heterozygous

• hybrid

• purebred

If a(n) ____________________ allele is present, its trait will appear in the organism.

• dominant

• recessive

When Mendel crossed purebred short

plants with purebred tall plants, all of the offspring were short.

• True

• False

A pea plant that is heterozygous for tall stems has the alleles Tt.

• True

• False