Chromosomal Inheritance

AP Biology· difficulty 1/5

In humans, sex is determined by the

A
$The total number of autosomal chromosomes (46 = male, 44 = female, in the typical case)$
B
$The ratio of X chromosomes to autosomes (1:1 = male, 2:1 = female, in the typical case)$
C
$Presence of the Y chromosome (XY = male, XX = female, in the typical case)$
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D
$The presence of mitochondrial DNA (maternal mtDNA = female, paternal mtDNA = male)$

Explanation

The SRY gene on Y triggers male development. XX females lack Y; XY individuals have Y \to male development.

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