Genetics Exam Review

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What is Incomplete Dominance?

Back

A genetic situation in which one allele does not completely dominate another allele, resulting in a new phenotype that is a blend of the two traits.

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What is Co-Dominance?

Back

A genetic scenario where both alleles in a heterozygote are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive.

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How are dominant alleles represented?

Back

Dominant alleles are represented by a capital letter.

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What is the genotype for a brown mouse in a scenario where black and white are homozygous?

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The genotype for a brown mouse is Bb (heterozygous).

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What is a mutation?

Back

A mutation is a change in the DNA sequence that can lead to changes in phenotype.

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What is a Substitution mutation?

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A type of mutation where one base pair in the DNA sequence is replaced by another base pair.

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What is a Deletion mutation?

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A type of mutation where one or more nucleotide pairs are removed from the DNA sequence.

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What is an Insertion mutation?

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A type of mutation where one or more nucleotide pairs are added into the DNA sequence.

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What is an Inversion mutation?

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A type of mutation where a segment of DNA is reversed within the chromosome.

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What is a phenotype?

Back

The observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences.