Genetics

Two identical alleles for a trait is known as

• homozygous

• heterozygous

• mutation

• codominance

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A physical appearance is

• genotype

• heterozygous

• phenotype

• codominance

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What does Pp mean?

• two dominant alleles

• heterozygous alleles

• one dominant allele

• two dominant and recessive alleles

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

• Gregor Mendel

• Albert Punnett

• Sir Isaac Newton

• David Kuster

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

• 25%

• 50%

• 75%

• 100%

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A purebred horse with white hair is crossed with a purebred horse with brown hair. Each of their offspring has both white and brown hair. Why does this occur?

• several alleles work together to determine a trait

• two alleles for hair are dominant

• two alleles for hair are recessive

• the alleles for fur color are neither dominant or recessive

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Factors that control traits are

• purebreds

• genes

• recessives

• parents

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Scientists call an organism with two different alleles for a trait

• factor

• purebred

• trait

• hybrid

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%

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What does RR mean

• two dominant alleles

• heterozygous alleles

• at least one dominant allele

• one dominant and one recessive allele

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