Genes & Chromosomes

What does the notation TT mean to a geneticist?

• 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

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What does a Punnett square show?

• all of Mendel’s discoveries about genetic crosses

• only the recessive alleles in a genetic cross

• only the dominant alleles in a genetic cross

• all the possible outcomes of a genetic cross

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

• offspring

• traits

• generations

• hybrids

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An organism’s genotype is its

• stem height

• feather color

• genetic makeup

• physical appearance

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Factors that control traits are called

• parents

• genes

• purebreds

• recessives

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Scientists call an organism that has two different alleles for a trait a

• dominant

• purebred

• factor

• hybrid

What does the notation Tt mean to geneticists?

• two dominant alleles

• one dominant and one recessive allele

• homozygous alleles

• two recessive alleles

What is probability?

• the number of times a coin lands heads up

• the actual results from a series of events

• the way the results of one event affect the next event

• a number that describes how likely it is that an event will occur

If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb), what is the probability that an offspring will have black fur?

• 25%

• 50%

• 75%

• 100%