Two heterozygous round yellow seeded pea plants are intercrossed. In the progeny, the trait for seed shape will segregate in the ratio:

  1. 1 : 1
  2. 3 : 1
  3. 1 : 1 : 1 : 1
  4. 9 : 3 : 3 : 1
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Given the parents AABBCc × AabbCc, assume simple dominance and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent?

  1. 1/4
  2. 1/8
  3. 3/4
  4. 3/8
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In a cross between AABB X aabb, the ratio of F2 genotypes between AABB, AaBB, Aabb and aabb would be:

  1. 9 : 3 : 3 : 1
  2. 2 : 1 : 1 : 2
  3. 1 : 2 : 2 : 1
  4. 7 : 5 : 3 : 1
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In peas, a tall, yellow-seeded plant is crossed with a homozygous short, green-seeded plant. The numbers of progeny are: 203 [tall, green-seeded plants], 199 [short, green-seeded plants], 207 [tall, yellow-seeded plants] and 192 [short, yellow-seeded plants]. The most likely genotype of the tall, yellow-seeded parent is:

  1. TtYy
  2. TTYY
  3. ttYY
  4. ttyy
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Which of the following terms best describes when the phenotype of the heterozygote differs from the phenotypes of both homozygotes?

  1. Incomplete dominance
  2. Multiple alleles
  3. Codominance
  4. Epistasis
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A man of blood group A marries a woman of AB blood group. Which type of progeny would indicate that man is heterozygous A?

  1. AB
  2. A
  3. O
  4. B
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The gene for eye color in a certain organism has seven alleles. How many genotypic combinations are possible?

  1. 2
  2. 14
  3. 28
  4. 56
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You are studying the genetics of bean pigmentation in a particular variety of bean plant. A bean plant that produces grey beans is self-pollinated and the numbers of each progeny type produced are - 50 white beans 107 grey beans 38 black beans. Assuming that TWO genes govern the bean pigmentation trait, the genetic hypothesis that best explains the inheritance pattern of bean pigmentation would be:

  1. dominant/recessive
  2. incomplete dominance
  3. incomplete penetrance
  4. recessive epistasis
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In chickens, gene R produces a rose-shaped comb, gene r produces a single comb, gene P produces pea-shaped comb and gene p produces a single comb. When P and R are both present in the genotype, the comb is walnut shaped. Two chickens with genotype RrPp are intercrossed. What will be the ratio of Walnut shaped, Rose shaped, Pea shaped and single comb progeny respectively:

  1. 3 : 1 : 1 : 3
  2. 1 : 1: 1 : 1
  3. 9 : 3 : 3 : 1
  4. 12 : 3 : 4
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Two pure lines of corn have mean cob lengths of 9 and 3 inches respectively. The polygenes involved in this trait all exhibit additive gene action. Crossing these two lines is expected to produce a progeny with mean cob length [in inches] of:

  1. 12.0
  2. 7.5
  3. 6.0
  4. 2.75
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