Lethal genes (genes that result in the failure to develop a vital organ or metabolic pathway) are nearly always recessive. Animal breeders who discover a unique trait and selectively breed to increase the occurrence of that trait often encounter a noticeable increase in lethal genes. Why? A. The lethal recessive gene may be incompletely dominant. B. Spreading the gene among offspring of both sexes will increase the likelihood it will be sex-linked and expressed. C, The selective-mating of closely related individuals, or inbreeding, increases chances that two recessive genes will "meet" in offspring. D. "Pleiotropy" - the gene that is being selected for this trait may have the second effect of being lethal. E. "Epistasis" - selection for the desired trait may result in "uncovering" the lethal gene.

Question

Biology

Aaliyah Martin

20 February, 06:46

Lethal genes (genes that result in the failure to develop a vital organ or metabolic pathway) are nearly always recessive. Animal breeders who discover a unique trait and selectively breed to increase the occurrence of that trait often encounter a noticeable increase in lethal genes. Why? A. The lethal recessive gene may be incompletely dominant. B. Spreading the gene among offspring of both sexes will increase the likelihood it will be sex-linked and expressed. C, The selective-mating of closely related individuals, or inbreeding, increases chances that two recessive genes will "meet" in offspring. D. "Pleiotropy" - the gene that is being selected for this trait may have the second effect of being lethal. E. "Epistasis" - selection for the desired trait may result in "uncovering" the lethal gene.

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Gretel · Answer 1

Answer: C

Explanation:

When breeders notice a unique trait of interest and selectively breed to increase their population, there is tendency of also increasing the population of lethal genes. This happens via a situation known as inbreeding depression. There is a tendency to mate closely related individuals in a bid to increase the occurrence of a desired phenotype. However, in a situation where these animals have a recessive lethal gene, it may result in a double recessive thus becoming obvious in the population.