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Lilit [14]
3 years ago
8

Some traits, such as earlobe attachment, blood type, and the presence or absence of dimples, have limited variation throughout t

he human population because they are controlled by a single gene. Other traits, such as skin color and human height, are widely variable throughout the human population because
Biology
2 answers:
zalisa [80]3 years ago
7 0

They are controlled by more than one gene

LekaFEV [45]3 years ago
3 0

Answer:

The correct answer would be "they are polygenic traits".

Polygenic traits are those which are controlled by at least two different genes.

As more than two genes are involved in controlling a single trait, so they show more variations as compared to the traits which are controlled by a single gene.

For example, height is controlled by at least three genes and thus six alleles are involved in regulating height.  

Polygenic traits often show a bell-shaped curve in a population.

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Option C

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If we consider Darwin's theory we would realize that the species which are not able to survive are unfit or weak. Thus, predators usually attack species that can be easily targeted. Hence, it this way predation leads to selective pressure on any species and hence leads to creation of a fit gene pool. The weak organisms are removed and more fit organism could mate among themselves to produce healthy offspring.  

 Hence, option C is correct

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