Respuesta :

Another exception to Mendel’s rules is polygenic inheritance, which occurs when a trait is controlled by more than one gene. This means that each dominant allele "adds" to the expression of the next dominant allele.

Usually, traits are polygenic when there is wide variation in the trait. For example, humans can be many different sizes. Height is a polygenic trait, controlled by at least three genes with six alleles. If you are dominant for all of the alleles for height, then you will be very tall.

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Answer:

For this trait to be polygenic means that there are many heights for this species of rats. That there is a wide variation in the trait. For example, if a rat is dominant for all the alleles for height, then it'd be very tall. Because its phenotype is influenced by more than one gene.

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