Chapter 14

Last update by Shanal on 10/20/2013
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) In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. Which of the following crosses would produce offspring in the ratio of

1 red:2 roan:1 white?

A) red × white

B) roan × roan

C) white × roan

D) red × roan

E) The answer cannot be determined from the information provided.

Answer:
B) roan × roan

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  • yosay
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  • yosay
    Answered in Chapter 14

    Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether cactuses have spines. Homozygous recessive nn cactuses have no spines at all.

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    B) 50% sharp-spined, 50% dull-spined progeny.

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  • yosay
    Answered in Chapter 14

    Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether cactuses have spines. Homozygous recessive nn cactuses have no spines at all.

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  • yosay
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    Feather color in budgies is determined by two different genes Y and B. YYBB, YyBB, or YYBb is green; yyBB or yyBb is blue; YYbb or Yybb is yellow; and yybb is white.

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    A woman who has blood type A, has a daughter who is type O positive and a son who is type B negative. Rh positive is a simple dominant trait over Rh negative.
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    A woman who has blood type A, has a daughter who is type O positive and a son who is type B negative. Rh positive is a simple dominant trait over Rh negative.

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  • yosay
    Answered in Chapter 14

    A.incomplete dominance

    B.multiple alleles

    C.pleiotropy

    D.epistasis

    the ability of a single gene to have multiple phenotypic effects

    C.pleiotropy