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Testosterone, produced by Leydig cells in testes, is the primary hormone regulating spermatogenesis. It acts on Sertoli cells and is essential for sperm production.
These structures share similar bone arrangements despite different functions, indicating descent from a common ancestor with modification—evidence for divergent evolution.
Using Hardy-Weinberg equation: frequency of Aa = 2pq = 2(0.7)(0.3) = 0.42. This remains constant across generations in equilibrium.
Allopatric speciation begins with geographic isolation, followed by independent genetic drift and mutations in isolated populations, leading to reproductive isolation and eventually new species formation.
Heterozygous female (X^W X^w) × normal male (X^W Y) produces X^W X^W and X^W X^w females, both with normal eyes. White eyes appear only in males (X^w Y) at 50%.
Homologous structures (similar structures with different functions) indicate common ancestry and provide strong anatomical evidence for evolution.
Common descent refers to the principle that all organisms share evolutionary ancestry, a fundamental concept in evolutionary biology.
Disruptive selection eliminates intermediate phenotypes and favors both extreme phenotypes, increasing genetic variation.
For AaBb × AaBb, probability of aa = 1/4 and bb = 1/4. Combined probability = 1/4 × 1/4 = 1/16.
Hardy-Weinberg equilibrium states that allele frequencies remain constant when no evolutionary forces (mutation, selection, migration, genetic drift) act on a population.