Genetics: The Science of Heredity

What did Gregor Mendel do to study different characteristics in his genetic experiment?

• He studied only asexual plants

• He studied only tall and short pea plants

• He cross-pollinated plants

• He cross-pollinated both plants and animals

What does the notation TT mean?

• Two dominant alleles

• Heterozygous alleles

• At least one dominant allele

• One dominant and one recessive allele

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

• one in four

• two in four

• three in four

• four in four

What does a Punnett square show?

• all the possible outcomes of a genetic cross

• only the dominant alleles in a genetic cross

• only the recessive alleles in a genetic cross

• all of Mendel's discoveries about genetic crosses

A purebred chicken with white feathers is crossed with a purebred chicken that has black feathers. Each of their offspring has both black and white feathers. Why does this happen?

• both alleles for feather color are dominant

• both alleles for feathers are recessive

• the alleles for feather color are neither dominant nor recessive

• several alleles work together to determine the trait

What is the chromosome theory oif inheritance?

• chromosomes are carried from parents to offspring on hybrids

• genes are carried from parents to offspring on chromosomes

• hybrid pairs of chromosomes combine to form offspring

• codominant genes combine to form new hybrids

What happens during meiosis?

• two sex cells combine

• chromosome pairs separate and are distributed into new sex cells

• each sex cell copies itself to form four new chromosomes

• chromosome pairs remain together when new sex cells are formed

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

• traits

• generations

• offspring

• hybrids

An organism's genotype is its

• genetic makeup

• physical appearance

• feather color

• stem height

Which of the following traits is influences in both inheritance and environmental factors?

• the ability to sing well

• ability to cough

• natural hair color

• dyed hair color