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Figure 24.10

Variations in eye color. A model of two genes, with two alleles each, can explain five human eye colors.

of protein called a transcription factor, which switches on other genes that direct development of male structures in the embryo, while suppressing formation of female structures. Because a female lacks a Y chromosome, she also lacks an SRY gene, and the "default" option of female development ensues. Figure 24.12 shows the sex chromosomes.

Peripheral Neuropathy Natural Treatment Options

Peripheral Neuropathy Natural Treatment Options

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