01:119:116 Lecture Notes - Lecture 14: Ejaculatory Duct, Vas Deferens, Seminiferous Tubule
6 Apr 2016
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Document Summary
2 or more identical ofsprings clones. No meiosis no fusion of gametes. Disadvantages: mutations pass from generation to generation. Small part of parent body separates ofspring. Parent breaks into pieces pieces produce missing parts. Male sperm + female egg (ovum) fertilization. Genetic recombination: offspring may be better suited to env than parents. Population may rid itself of harmful genes easily. Env cues trigger hormones or hormonal secretion controls reproductive cycles. Produce offspring only when env = suitable. Migrate to calving grounds in spring cuz lots of plants are present in spring. They arrive at same time as plants sprung/ grew. Average spring temperature 4 c plants sprout earlier. Caribou migration trigger = daylength not temperature. Average # of caribou went 75% because they came later than. Ex: water fleas lay two types of eggs. One egg requires fertilization to develop used under env stress. Genetic recombination gives offspring chance to fight env stress.
