Two heterozygous tall plants are intercrossed, what percentage of tall progeny will be homozygous tall?

  1. 25
  2. 33
  3. 50
  4. 66

Concept Questions :-

Monohybrid Cross-1
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Which of the following about the law of segregation is true?

  1. It states that each of two alleles for a given trait segregate into same gametes.
  2. It can be explained by the segregation of heterologous chromosomes during meiosis.
  3. It can account for the 3:1 ratio seen in the F2 generation of Mendelʹs crosses.
  4. It is a method that can be used to determine the number of chromosomes in a plant.
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In guinea pigs, black coat color is a dominant trait and white is a recessive trait. When heterozygous black pigs are intercrossed the chance of the first two offspring being black is:

  1. 75 %
  2. 56 %
  3. 44 %
  4. 6 %

Concept Questions :-

Law - of - Segregation
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The minimum progeny population size allowing for random union of all kinds of gametes from AaBbCc parents is:

  1. 9
  2. 16
  3. 27
  4. 64

Concept Questions :-

Dihybrid Cross Analysis
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How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?

  1. 4
  2. 8
  3. 16
  4. 32
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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

Concept Questions :-

Monohybrid Cross-1
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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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