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In a cross between a homozygous tall plant (TT) and a homozygous short plant (tt

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Question: In a cross between a homozygous tall plant (TT) and a homozygous short plant (tt), what will be the genotype of the F1 generation? (2019)

Options:

  1. TT
  2. tt
  3. Tt
  4. TtTt

Correct Answer: Tt

Exam Year: 2019

Solution: 

The genotype of the F1 generation from a cross between TT and tt will be Tt (all offspring will be heterozygous).

In a cross between a homozygous tall plant (TT) and a homozygous short plant (tt

Practice Questions

Q1
In a cross between a homozygous tall plant (TT) and a homozygous short plant (tt), what will be the genotype of the F1 generation? (2019)
  1. TT
  2. tt
  3. Tt
  4. TtTt

Questions & Step-by-Step Solutions

In a cross between a homozygous tall plant (TT) and a homozygous short plant (tt), what will be the genotype of the F1 generation? (2019)
  • Step 1: Identify the genotypes of the parent plants. One parent is homozygous tall (TT) and the other is homozygous short (tt).
  • Step 2: Understand that 'homozygous' means both alleles are the same. 'TT' means both alleles are tall, and 'tt' means both alleles are short.
  • Step 3: When these two plants are crossed, each parent contributes one allele to the offspring.
  • Step 4: The tall parent (TT) can only contribute a 'T' allele.
  • Step 5: The short parent (tt) can only contribute a 't' allele.
  • Step 6: Combine the alleles from both parents. The offspring will have one 'T' from the tall parent and one 't' from the short parent.
  • Step 7: The resulting genotype of the F1 generation will be 'Tt', which means all offspring will be heterozygous.
  • Mendelian Genetics – Understanding the principles of inheritance, specifically the concept of dominant and recessive alleles in a monohybrid cross.
  • Genotype vs. Phenotype – Differentiating between the genetic makeup (genotype) and the observable traits (phenotype) of the offspring.
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