18.Human males have non identical sex chromosomes (XY) while females have identical ____chromosomes.
a. YY
b..ZZ
c. TT
d. XX
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18.Human males have non identical sex chromosomes (XY) while females have identical ____chromosomes.
a. YY
b..ZZ
c. TT
d. XX
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Answer:
(D)
Explanation:
Females have two X chromosomes, while males have one X and one Y chromosome. Early in embryonic development in females, one of the two X chromosomes is randomly and permanently inactivated in cells other than egg cells. This phenomenon is called X-inactivation or lyonization.