01:119:116 Lecture Notes - Lecture 14: Vas Deferens, Seminiferous Tubule, Ejaculatory Duct
25 Jul 2017
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Document Summary
Intro to animal reproduction: c/c, seq animal reproduction. Male anatomy and physiology: c/c components of male reproduction, seq sperm path. Budding smaller daughter grows from parent (jellyfish) Fission splitting into two ~equal parts (jellyfish) Fragmentation and regeneration can regrow from a fragment of body (sea stars) Parthenogenesis unfertilized haploid eggs grow into male offspring (ants, bees) Rapid many offspring in short time (less e expended) Reproduction involving production and fusion of gametes. Egg (ovum) large, nonmotile, contains nutrients for embryo. Involved fertilization fusion of sperm and egg to form diploid zygote. 2n adult (meiosis) n + n (fertilization) 2n zygote (mitosis) 2n adult. Reproductive handicap only of population can actually reproduce. Takes more e and time: but benefits of sexual repro outweigh the costs genetic variation. Get rid of harmful alleles or combinations of alleles. Offspring may be more fit than parents. More likely that some of population can survive environmental changes. Most animals have cycles of reproductive activity.
