A researcher believes that she had found the gene that determines weight in mice. However, when she removes this gene from all of the cells in an animal, she observes that there is no difference between its weight and that of untreated mice. Furthermore, she can observe no other atypical phenotypes in the subject mouse. How can this be explained?

Weight in mice is influenced by multiple alleles of the same gene.

Weight in mice is a polygenic trait.

Only the recessive allele of the gene determines an animal's weight.

The gene removed from the animal is pleiotropic.

Her observation might be as a result of the weight trait being a polygenic trait. A polygenic trait is a trait are train that are controlled by two or more genes. Additive interactions of these genes can influence expression of the trait. Thus weight is expression of a trait influenced by two or more genes. This to knock out the trait, she has to all genes involved in the expression and not just one gene.

andromache andromache · Answer 2 · 2022-03-01T17:30:46+01:00

The explanation should be done by Weight in mice is a polygenic trait

Measurement of weight in mice:

Her observation leads to the weight trait and is treated as a polygenic trait. A polygenic trait refers to a trait that are trained and controlled by two or more genes. If these interactions are Additive so these genes can impact expression of the trait. Due to this, the weight is an expression of a trait that impact by two or more genes.

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