Genetics 2021

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What is a gene?

Back

A gene is a segment of DNA on a chromosome that codes for a trait.

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What are alleles?

Back

Alleles are the different forms of a gene.

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What does heterozygous mean?

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Heterozygous refers to having two different alleles for a trait.

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What does purebred mean?

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Purebred describes the offspring of many generations that have the same traits.

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What does homozygous mean?

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Homozygous refers to having two identical alleles for a trait.

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What is a chromosome?

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A chromosome is a structure within cells that contains DNA and genes.

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What is a phenotype?

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A phenotype is the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

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What is the difference between genotype and phenotype?

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Genotype refers to the genetic makeup of an organism, while phenotype refers to the physical expression of that genetic makeup.

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What is a dominant allele?

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A dominant allele is an allele that expresses its trait even when only one copy is present.

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What is a recessive allele?

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A recessive allele is an allele that expresses its trait only when two copies are present.