Cells 18

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Last updated 3:15 AM on 6/7/26
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14 Terms

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What is a gene?
A section of DNA that influences a trait.
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What is an allele?
A different version of the same gene.
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What is a locus?
The specific position of a gene on a chromosome.
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Why do diploid organisms have two alleles for most genes?
One allele is inherited from each parent.
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What is a genotype?

The allele combination an organism have

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What is a phenotype?

The physical characteristics of an organism.

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What is a dominant allele?
An allele that is expressed when present in one copy.
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What is a recessive allele?
An allele that is only expressed when two copies are present.
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What is a monohybrid cross?
A genetic cross involving one gene.
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What is the phenotypic ratio of a monohybrid F2 cross?
3:1.
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What is the genotypic ratio of a monohybrid F2 cross?
1:2:1.
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What is a test cross?
Crossing an individual with a dominant phenotype to a homozygous recessive individual.
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what is law of Segregation?

two alleles separate during meiosis so each gamete receives only one allele.

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What is the Law of Independent Assortment.

alleles of different genes assort independently during gametes formation.