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Biology

Review Questions

BiologyReview Questions

Review Questions

5.

Mendel performed hybridizations by transferring pollen from the _______ of the male plant to the female ova.

  1. anther
  2. pistil
  3. stigma
  4. seed
6.

Which is one of the seven characteristics that Mendel observed in pea plants?

  1. flower size
  2. seed texture
  3. leaf shape
  4. stem color
7.

Imagine you are performing a cross involving seed color in garden pea plants. What F1 offspring would you expect if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over green.

  1. 100 percent yellow-green seeds
  2. 100 percent yellow seeds
  3. 50 percent yellow, 50 percent green seeds
  4. 25 percent green, 75 percent yellow seeds
8.

Consider a cross to investigate the pea pod texture trait, involving constricted or inflated pods. Mendel found that the traits behave according to a dominant/recessive pattern in which inflated pods were dominant. If you performed this cross and obtained 650 inflated-pod plants in the F2 generation, approximately how many constricted-pod plants would you expect to have?

  1. 600
  2. 165
  3. 217
  4. 468
9.

The observable traits expressed by an organism are described as its ________.

  1. phenotype
  2. genotype
  3. alleles
  4. zygote
10.

A recessive trait will be observed in individuals that are ________ for that trait.

  1. heterozygous
  2. homozygous or heterozygous
  3. homozygous
  4. diploid
11.

If black and white true-breeding mice are mated and the result is all gray offspring, what inheritance pattern would this be indicative of?

  1. dominance
  2. codominance
  3. multiple alleles
  4. incomplete dominance
12.

The ABO blood groups in humans are expressed as the IA, IB, and i alleles. The IA allele encodes the A blood group antigen, IB encodes B, and i encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (IAi) and a heterozygous blood type B parent (IBi) mate, one quarter of their offspring will have AB blood type (IAIB) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of:

  1. multiple alleles and incomplete dominance
  2. codominance and incomplete dominance
  3. incomplete dominance only
  4. multiple alleles and codominance
13.

In a mating between two individuals that are heterozygous for a recessive lethal allele that is expressed in utero, what genotypic ratio (homozygous dominant:heterozygous:homozygous recessive) would you expect to observe in the offspring?

  1. 1:2:1
  2. 3:1:1
  3. 1:2:0
  4. 0:2:1
14.

Assuming no gene linkage, in a dihybrid cross of AABB x aabb with AaBb F1 heterozygotes, what is the ratio of the F1 gametes (AB, aB, Ab, ab) that will give rise to the F2 offspring?

  1. 1:1:1:1
  2. 1:3:3:1
  3. 1:2:2:1
  4. 4:3:2:1
15.

The forked line and probability methods make use of what probability rule?

  1. test cross
  2. product rule
  3. monohybrid rule
  4. sum rule
16.

How many different offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits when the traits behave in a dominant and recessive pattern? How many phenotypes?

  1. 64 genotypes; 16 phenotypes
  2. 16 genotypes; 64 phenotypes
  3. 8 genotypes; 27 phenotypes
  4. 27 genotypes; 8 phenotypes
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