Male stickleback fish have more parental investment than females, but females are the choosy sex. Why?Anisogamy and the Cost of Gametes in Sexual Reproduction:Anisogamy is the occurrence of two differently sized gametes, egg, and sperm. The production of the differently ...
How did the perspectives of botanists and zoologists differ regarding the role of hybridization in evolution? How have gene variants moved between Neanderthals and early humans, and what implications does this have for our understanding of human ancestry? What role did natural selection play in the ...
While it is widely acknowledged that Darwin’s descriptions of females were gender-biased, gender bias in current sexual selection research is less recognized. An examination of the history of sexual selection research shows prevalent male precedence—that research starts with male-centered investigations...
There are 45 species of marine fish in the genus Hippocampus, called a seahorse. Evolutionary they linked to the pipefish. The reproduction of seahorse involves depositing up to 1500 eggs by the female into the male's pouch where he carries them for 9-45 days until delivery. After th...
Why did we evolve to be so different? This question becomes even more acute when we compare ourselves with our closest relatives among the world's mammal species, the great apes (as distinguished from the gibbons or little apes). Closest of all are Africa's chimpanzee and bonobo, from ...