Examlex
Late-maturing boys are more likely to have a ________ when compared to early-maturing boys.
Allele
One of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.
Infertile
The inability to conceive a child after regular, unprotected sexual intercourse over a certain period of time, typically a year.
X Chromosome
One of the two sex chromosomes, present in both males (XY) and females (XX), that carries genes responsible for the development of many traits.
Central Nervous System
The complex of nerve tissues that controls the activities of the body, comprising the brain and the spinal cord.
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