Lecture 7

Lecture 7 - Bio 121 Lecture 7 reproductive strategies of...

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Bio 121 Lecture 7 – reproductive strategies of organisms A. Life from Life a. All organisms are mortal b. Reproduction continues organism (sexual/asexual) B. Asexual reproduction (all genes from 1 parent) a. Binary fission (prokaryotes) a.i. Replicate chromosome a.ii. Double in size a.iii. Split cells b. Budding (exp hydra) b.i. New individual begins as a mass of dividing cells c. Fragmentation c.i. A body is broken and each develop into new organisms (algae, some invertebrates, star fish) d. Vegetation reproduction d.i. Runners that take root daughter plant e. Parthogenensis e.i. Birth from haploid unfertilized eggs C. Sexual reproduction a. Meiosis – halve of genetic material (haploid gamete) b. Syngomy (fertilization) – joining of 2 gametes c. Makes variable offspring d. One parent = hermaphrodite (both gamete from single parent) d.i. Seed plants d.ii. Most invertebrates d.iii. Can mate with any other individual of same species d.iv. Increases chance of finding mate by 2 d.v.
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Lecture 7 - Bio 121 Lecture 7 reproductive strategies of...

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