Genetics Review

Two identical alleles for a trait is known as

• homozygous

• heterozygous

• mutation

• codominance

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A physical appearance that is expressed is the

• genotype

• heterozygous

• phenotype

• codominance

A mutation is harmful to an organism if it

• changes the phenotype of an organism

• changes the DNA segment

• reduces the organism's chance of survival

• makes the organism better able to avoid predators

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

• Gregor Mendel

• Albert Punnett

• Sir Isaac Newton

• David Kuster

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

• 25%

• 50%

• 75%

• 100%

Genotype is

• stem height

• feather color

• physical appearance

• genetic makeup

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NGSS.HS-LS3-1

The term that relates to physical characteristics that are studied in genetics.

• traits

• offspring

• generations

• hybrids

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Factors that control traits are

• purebreds

• genes

• recessives

• parents

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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

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An organisms's allele combination is known as

• phenotype

• mutation

• hybrid

• genotype