Poultry breeders have developed breeds of chickens that differ radically in egg

Question

Poultry breeders have developed breeds of chickens that differ radically in egg weight, body weight, albumin content of eggs, and time to sexual maturity. A trait that appears to be somewhat, but not wholly, resistant to selection for additional gain in current flocks is the number of eggs laid per hen per year. What does this tell you about the genetic variation for this trait in chickens? What does it tell you about the heritability of this trait? What does it tell you about the overall variability of this trait?

Explanation / Answer

Genetic variability is the variation in the change in the frequency of gene that lead to diversity in gene frequencies .It is the variation that lead to the useful trait that is useful to the chicken.

Genetic variation can be access by the genetic pool of the chicken. Heritability is the proportion of variance of a particular trait that is carried by successive generation. Hence, in this case, poultry breeders have developed breeds of chickens , so its heritability will be checked by the breeders or by checking gene pool of the hybrid population. Since,in the question, resistant to selection for additional gain is not inherited, so its hertibility is not complete. Overall variability is higher in the breed of chicken because chicken differ radically in egg weight, body weight, albumin content of eggs, and time to sexual maturity.

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