Biology I Non-Mendelian Genetics

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If a characteristic is sex-linked, it

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occurs most commonly in males.

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Since the allele for colorblindness is located on the X chromosome, colorblindness

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is sex-linked.

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A diagram in which several generations of a family and the occurrence of certain genetic characteristics are shown is called a

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pedigree.

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What would be the blood type of a person who inherited an A allele from one parent and an O allele from the other?

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type A

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Both sickle-cell anemia and hemophilia

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are caused by genes coding for defective protein.

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A cross of a red cow (RR) with a white bull (WW) produces all roan offspring (RRWW). This type of inheritance is known as

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codominance.

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When roan cattle are mated, 25% of the offspring are red, 50% are roan, and 25% are white. The coat of a roan cow consists of both red and white hairs. This trait is controlled by:

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codominant alleles

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A man heterozygous for blood type A marries a woman heterozygous for blood type B. The chance that their first child will have type O blood is

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25%

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The type of inheritance shown when a red-flowering plant is crossed with a white-flowering plant and only pink-flowering plants are produced is

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incomplete dominance

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A trait controlled by four alleles is said to have

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multiple alleles