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In a certain species, the allele for long tails (L) is dominant over the allele

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Question: In a certain species, the allele for long tails (L) is dominant over the allele for short tails (l). If a long-tailed individual is crossed with a short-tailed individual, what is the expected genotype of the offspring if the long-tailed individual is heterozygous?

Options:

  1. LL
  2. Ll
  3. ll
  4. LL or Ll

Correct Answer: Ll

Solution: 

The cross Ll x ll will produce offspring with genotypes Ll and ll, so the expected genotype is Ll.

In a certain species, the allele for long tails (L) is dominant over the allele

Practice Questions

Q1
In a certain species, the allele for long tails (L) is dominant over the allele for short tails (l). If a long-tailed individual is crossed with a short-tailed individual, what is the expected genotype of the offspring if the long-tailed individual is heterozygous?
  1. LL
  2. Ll
  3. ll
  4. LL or Ll

Questions & Step-by-Step Solutions

In a certain species, the allele for long tails (L) is dominant over the allele for short tails (l). If a long-tailed individual is crossed with a short-tailed individual, what is the expected genotype of the offspring if the long-tailed individual is heterozygous?
  • Step 1: Identify the alleles. The long tail allele is L (dominant) and the short tail allele is l (recessive).
  • Step 2: Determine the genotypes of the parents. One parent is heterozygous (Ll) and the other is homozygous recessive (ll).
  • Step 3: Set up the cross. We will cross Ll (long-tailed) with ll (short-tailed).
  • Step 4: Use a Punnett square to find the possible genotypes of the offspring. The top of the square will have Ll and the side will have ll.
  • Step 5: Fill in the Punnett square. The combinations will be Ll (from L and l) and ll (from l and l).
  • Step 6: Analyze the results. The offspring can either be Ll (long-tailed) or ll (short-tailed).
  • Step 7: Conclude the expected genotype of the offspring. The expected genotypes are Ll and ll, but the question asks for the expected genotype, which is Ll.
  • Mendelian Genetics – Understanding dominant and recessive alleles, and how they combine in offspring.
  • Punnett Squares – Using Punnett squares to predict the genotypes of offspring from parental crosses.
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