A.The gender of a baby is determined at conception by the sex chromosome of the fertilising sperm. Sexual differentiation of the foetus occurs from week 6.
Q.Do spiders have nipples
A.The spider, like most arthropods, has no penis or nipples. Males impregnate the females by depositing a drop of sperm on some silk, which is passed on.
Q.How big are a sperm whales nipples?
A.The nipple diameter of a sperm whale is around 600mm. Blue whales have the largest nipples of all mammals, at 660mm, but size increases during lactation.