Genetics

Gene locus is the physical site or location of a specific ​ (a)   on a ​ (b)   .

• gene
• chromosome

We all have two alleles, or versions, of each gene. Being ​ (a)   for a particular gene means you inherited two identical versions. It's the opposite of a ​ (b)   genotype, where the alleles are different. People who have recessive traits, like blue eyes or red hair, are always homozygous for that gene.

• homozygous
• heterozygous

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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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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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What does Pp mean?

• two dominant alleles

• heterozygous alleles

• two recessive alleles

• two dominant and recessive alleles

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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What does a Punnett Square determine?

• all of Mendel's discoveries about genetic crosses

• all the outcomes of a genetic cross

• only the recessive allele combinations

• only the dominant allele combinations

Genotype is

• stem height

• feather color

• physical appearance

• genetic makeup

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