Answer:
A trait is most likely to exhibit continuous variation if it is controlled by many gene loci, each with several possible alleles.
A trait is a characteristic of the attributes that distinguish the organism. It can exhibit continuous variation if controlled by many gene loci, individually with several probable alleles. Thus, option d is correct.
Continuous variations are the genetic variation that is said to exhibit persistent and successive phenotypical characteristics over the generation. It is majorly governed by various genes.
The two or more number of individual genes are involved and work together to impact the traits of certain characters of the continuous variation. It may be said as the result of polygenic inheritance.
The height, hair color, weight, and eye color, are some of the traits that are controlled by polygenic inheritance. They involve various gene pairs that control and regulate their expressions.
Therefore, option d. the continuous variation is regulated by various alleles.
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Your question is incomplete, but most probably your full question was,
A trait is most likely to exhibit continuous variation if it is controlled by
a. a single pleiotropic gene locus with three possible alleles.
b. a single gene locus with two codominant alleles.
c. many gene loci, each with a single possible allele.
d. many gene loci, each with several possible alleles.
e. two gene loci with epistasis.
