Bio quiz genetics


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  • 1. Open-ended
    30 seconds
    1 pt
    In crossing a homozygous recessive with a heterozygote, what is the chance of getting an offspring with the homozygous recessive phenotype? A) 25% B) 100% C) 75% D) 50% E) 0%
  • 2. Open-ended
    30 seconds
    1 pt
    In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. When two roan cattle are crossed, the phenotypes of the progeny are found to be in the ratio of 1 red:2 roan:1 white. Which of the following crosses could produce the highest percentage of roan cattle? A) roan x roan B) white x roan C) red x roan D) red x white E) All of the above crosses would give the same percentage of roan
  • 3. Open-ended
    30 seconds
    1 pt
    Albinism (lack of skin pigmentation) is caused by a recessive autosomal allele. A man and woman, both normally pigmented, have an albino child together. The couple decides to have a second child. What is the probability that this child will be albino? A) 1 B) 1/2 C) 3/4 D) 1/4 E) 0
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