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In a test cross, an individual with an unknown genotype is crossed with a homozy

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Question: In a test cross, an individual with an unknown genotype is crossed with a homozygous recessive individual. What is the purpose of this cross?

Options:

  1. To determine the dominant allele
  2. To determine the recessive allele
  3. To determine the genotype of the unknown
  4. To determine the phenotype of the offspring

Correct Answer: To determine the genotype of the unknown

Solution: 

The purpose of a test cross is to determine the genotype of an individual with a dominant phenotype by crossing it with a homozygous recessive individual.

In a test cross, an individual with an unknown genotype is crossed with a homozy

Practice Questions

Q1
In a test cross, an individual with an unknown genotype is crossed with a homozygous recessive individual. What is the purpose of this cross?
  1. To determine the dominant allele
  2. To determine the recessive allele
  3. To determine the genotype of the unknown
  4. To determine the phenotype of the offspring

Questions & Step-by-Step Solutions

In a test cross, an individual with an unknown genotype is crossed with a homozygous recessive individual. What is the purpose of this cross?
Correct Answer: To determine the genotype of an individual with a dominant phenotype.
  • Step 1: Understand that a test cross is used to find out the genotype of an individual with a dominant trait.
  • Step 2: Know that the individual with the unknown genotype can either be homozygous dominant (two dominant alleles) or heterozygous (one dominant and one recessive allele).
  • Step 3: The individual with a homozygous recessive genotype has two recessive alleles and will always show the recessive phenotype.
  • Step 4: Cross the individual with the unknown genotype with the homozygous recessive individual.
  • Step 5: Observe the offspring from this cross.
  • Step 6: If all offspring show the dominant phenotype, the unknown individual is likely homozygous dominant.
  • Step 7: If some offspring show the recessive phenotype, the unknown individual is likely heterozygous.
  • Test Cross – A genetic cross used to determine the genotype of an individual with a dominant phenotype by mating it with a homozygous recessive individual.
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