Examlex
The intelligence of fraternal twins raised in the same home is more similar than the intelligence of nontwin siblings raised in the same home. This finding provides evidence for the effects of environment on intelligence.
Recessive
A term used in genetics to describe a trait or gene that is expressed only when two copies of the gene are present, as opposed to a dominant trait which is expressed when only one copy is present.
Klinefelter's Syndrome
A genetic condition affecting males, characterized by an extra X chromosome, leading to symptoms like reduced fertility and physical development.
X Chromosome
One of the two sex chromosomes, present in both males (XY) and females (XX), that carries genes responsible for the development of female physical characteristics and genetic disorders.
Masculine Characteristics
Traits or qualities traditionally considered to be typical or appropriate for men, such as assertiveness or strength.
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