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Hornless cattle is dominant over horned. A homozygous hornless bull is mated with a homozygous horned cow. What will be the genotype and phenotype of the first generation?

Respuesta :

Genotype:

Hh. where H is hornless and h is horned.

Phenotype:

Hornless cattle.

The genotype and phenotype of the first generation in the given condition would be:

  • Genotype - Hh
  • Phenotype - hornless cattle

A dominant allele gives rise to a character that is phenotypically expressed and removes other allele's character. This means the dominant allele masks the recessive allele.

  • A Hzygous allele is having the exact same alleles as a particular gene. As it is given here, the bull has two dominant or and cow having two recessive alleles in a gene.
  • The genetic makeup of an individual organism is called genotype
  • Physical characteristics of an individual are expressed as a result of genotype.

Let assume the hornless character has an allele H and the horned trait has an allele h, then cross between -

      hornless bull (HH)  X   horned cow (hh)

Gametes: H, H, and h, h.

Cross with Punnett square -

    H       H

h   Hh    Hh

h  Hh    Hh

Here, all the first-generation offspring would have a heterozygous genotype with a hornless phenotype.

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