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Which of the following is a sex-link character?

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BIOLOGY

Which of the following is a sex-link character?

A. Dwarfism

B. Albinism

C. Tongue rolling

D. Colour blindness

QUICK ANSWER…

D

DETAILS…  

Sex-link character is often a disorder found to be mostly prevalent on a particular sex. They are often hereditary and could be traced to a particular chromosome.

Now for the right answer to the above question:

  1. Dwarfism is a trait evenly found in both male and female, the trait of dwarfism is not limited to a particular chromosome. so, A is incorrect.
  2. Albinism is a defect found to affect both male and female in almost equal proportion, the trait of albinism is not also limited to a particular sex chromosome. B is also incorrect.
  3. Tongue rolling also is a character evenly found in both male and female, a person born with one or two dominant allele of the gene for tongue rolling ends up having the ability. This could be male or female. So, C is also incorrect.
  4. D is correct; colour blindness is a trait that affect vision genes found on the X-chromosome. Now, we know that the X-chromosome is responsible for the conception of the male child, hence colour blindness affects mostly men.

QUICK ADVICE…

You may please note that:

  • The X-chromosome is the male determining factor at conception, any condition that only affects it becomes sex-linked.

Use the questions and answers session to raise further questions and deal more on this topic…

/ culled from 2017 JAMB-UTME biology question 24 /

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