alleles

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10 Terms

1

what are alleles?

different forms of the same gene

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2

can both copies of a gene be different?

yes, each copy may be a different allele

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3

what causes genetic variation in humans?

different combinations of alleles in each person

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4

what does it mean if an organism is homozygous for a gene?

it has two identical alleles for that gene

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5

what does it mean if an organism is heterozygous for a gene?

it has two different alleles for that gene

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6

how many copies of each chromosome do gametes have?

only one copy of each chromosome

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7

how many copies of a gene do gametes contain?

only one copy of each gene

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8

when is a recessive characteristic seen?

only if both alleles are recessive

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9

what is an organism’s genotype?

the combination of alleles it has

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10

what is an organism’s phenotype?

the physical characteristics an organism displays

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