Genes & Alleles

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6 Terms

1
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Q: What is a gene?

A: A segment of DNA that codes for a trait.

2
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Q: What is an allele?

A: An alternative version of a gene.

3
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Q: What does homozygous mean?

A: Having two identical alleles for a gene.

4
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Q: What does heterozygous mean?

A: Having two different alleles for a gene.

5
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Q: What is a dominant allele?

A: An allele that is always expressed if present.

6
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Q: What is a recessive allele?

A: An allele that is only expressed if both copies are recessive.