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Give two ways nature uses to hide differences between X- and Y-sperm in mammals?
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- Compare and contrast gametogenesis in starfish and sea urchin.Generate a hypothesis that may explain how contact by a sperm to the outside of the cell membrane of an oocyte causes a wave of Ca2+ release that spreads through the entire egg (as shown in Figure 15.29)Compare the male and female reproductive organs of reptiles and birds. Explain how are their reproductive patterns advantageous for their survival?
- Compare and contrast the oogenesis and spermatogenesis in zebrafish and drosophila melanogasterWhy does continued breastfeeding decrease the chance of pregnancy? (Hint: Think about the effect the breastfeeding hormones have on estrogens and progesterone.)?A black female cat (XBXB) and an orange male cat (X0Y) weremated to each other and produced a male cat that was calico.Which sex chromosomes did this male offspring inherit from itsmother and father? Remember that the presence of the Y chromosome determines maleness in mammals