BIOLOGY

JAMB 2011 - Question 42

Biology 2011 JAMB Past Questions - Question 42: The inheritable characters that are determined by a gene located only on the X-chromosome is

Choose the most appropriate option for the gap .
The inheritable characters that are determined by a gene located only on the X-chromosome is
A:
B:
C:
D:
Examkits App

Examkit's JAMB CBT App

Practice JAMB offline with our Online, PC and Mobile App

  • ✅ 25+ years of past questions (2000 to 2025)
  • ✅ Video solutions and explanation to questions
  • ✅ E-library
  • ✅ Study by topic
  • ✅ And more.

Correct Answer

D

Explanation

The characters attached to the genes attached only on the X chromosome are sex-linked characters. Such characters are baldness, colour blindness and haemophilia. Homozygous is a condition in which the two genes responsible for the transmission of a character are similar eg TT. fortallnessortt for shortness. • Dominant character is the character that expresses itself in the appearance of an organism even in the presence of recessive character. Recessive character is the character that expresses itself only in a homozygous state (tt) but remains hidden or marked once the dominant character is present.