Genetics Review

Two parrots have different parents. One has a blue tail and the other does not. Why do the parrots have different colored tails?

• Each parrot has different tail colors because different parents will have different color tails.

• Each parrot has different tail colors because they have different versions of the gene for tail color that connect together to make different tail colors.

• Each parrot has different versions of the gene for tail color. The genes are split inside one parrot and not the other.

• The parrot has different versions of the gene for tail color, this instructs for different proteins that connect in different ways to make different tail colors.

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An organism has how many copies of a gene for each feature?

• 1

• 2

• 3

• 4

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Heterozygous means there is/are............

• 0 copies of the same gene.

• 1 copy of the same gene.

• 2 copies of the same gene.

• 2 copies of genes that are different.

The organelle where all genetic material is stored containing the codes to make proteins.

• Cell

• Nucleus

• Ribosome

• Protein molecule

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What is the term for the physical appearance of an organism?

• Phenotype

• Genotype

• Allele

• Chromosome

What is the term for the physical and behavioral characteristics of an organism?

• Genotype

• Phenotype

• Allele

• Chromosome

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How many chromosomes do humans have?

• 46

• 21

• 10

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What is the basic unit of heredity that is passed from parents to offspring?

• Chromosome

• Gene

• DNA

• Protein

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Which of the following best describes a dominant allele?

• An allele that is masked by a recessive allele

• An allele that is expressed only in the homozygous state

• An allele that is always expressed when present

• An allele that is found only in males

In the context of genetics, what is a genotype?

• The physical appearance of an organism

• The set of genes in our DNA which is responsible for a particular trait

• A type of gene that is not expressed as a trait

• The study of heredity and the variation of inherited characteristics

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