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| fertilization of the egg by the sperm |
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| new organism risen as a result of sperm and egg |
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| found in reptiles and birds - large animals developing outside the mother's body have large eggs with lots of yolk to produce nutrients since they cannot get it from the mother's placenta |
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| found in mammals - Large animals developing within mother's body have small eggs with very small amount of yolk because nutrients are gotten from the mother's placenta |
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| found in frogs and fish - eggs with moderate yolk |
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| found in starfish, frogs, mammals - eggs with equal distribution of yolk |
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| found in scorpions, fish, reptiles - eggs with unequal distribution of yolk - one side of the egg has non-yolky material and the other side is yolk concentrated |
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| eggs found in arthropods other than scorpions - one side of the egg has non-yolky material and the other side is yolk concentrated |
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| final product of a single sperm cell nucleus into the interior of an egg cell |
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| rupturing of the jelly coat of an egg cell by the hydrolytic enzymes released from the acrosome of the sperm cell head |
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| 2nd part of fertilization - fusion of the gamets membranes |
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| joining of more than one sperm cell joining an egg's membrane (abnormal and undesirable situation)=it can abort development |
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| increase of Ca+2 ions causes changes of the pH of the egg cytoplasm which result in activating metabolic machinery of the egg |
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