BIOLOGY
JAMB 2003 - Question 40
Biology 2003 JAMB Past Questions - Question 40: if the pair of alleles for baldness is given as Bb, a female carrier will be denoted by
Choose the most appropriate option for the gap .
A:
B:
C:
D:
Correct Answer
D
Explanation
Baldness like hemophilia and colour blindness are recessive trails that are carried by the X-chrornosomes only. They are recessive. Baldness is denoted by small letter" b" while capital letter 'B' denotes absence of the recessive trait. The sex chromosomes of a woman are similar and represented by XX. A woman is a carrier if one of the alleles or genes carries the baldness trait on one of the chromosomes. XBXB shows that the woman is not bald. In males, the sex chromosomes are not similar and are represented by XY. Once the xchromosome carries the" recessivetrait" b", the man becomes b aid. (XbY). Options B andC show that the woman and man respectively are not bald.
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