BIOSC 0370 Lecture Notes - Lecture 9: Bed Bug, Sexual Dimorphism, Y Chromosome
24 Apr 2018
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Document Summary
Reproduction, can be sexual or asexual, sexual reproduction, mechanism by which progeny inherit dna from 2 parents, gametes from parents fuse to form offspring, gametes in humans are haploids, produced through the process of meiosis. Some animals can do it to (hydras, corals, etc. : bacteria duplicate their genes and then divide the cell into two via a process known as. Binary fission: parthenogenesis, creating an embryo without fertilization, offspring arise from diploid eggs, requires no genetic contribution from sperm, common in plants and invertebrates, animal species that reproduce only by parthenogenesis are all females. Sex evolves when selection changes over space (migration) Sex evolves when organisms are less adapted to their environment. Sex evolves when populations are finite: benefits of sexual reproduction, purging mutations. In asexual species: mutations will continue to pile up over time. Forces hosts to adapt rapidly as well: via genetic recombination, hosts that do not adapt, die out, known as the red queen hypothesis.
