Biology 1001A Lecture Notes - Lecture 14: Golden Ratio, Parental Investment, Bird Vocalization
6 Dec 2016
School
Department
Course
Professor
Document Summary
Generation of new multi-locus combinations of alleles. Offspring are genetically distinct from either parent and usually from each other: unless identical twin, armadillos creates 4 genetically identical offspring!! Examples of genetic exchange/ recombination without reproduction, and of reproduction without genetic exchange/ recombination. Mating tubes between two bacteria exchange alleles (donor can transfer some of its dna, like plasmids etc. ) Reproduction without recombination: asexual reproduction (binary fission, obligately asexual due to every individual only having one sex/gender parthenogenesis, facultatively asexual/vegetative propagation during favourable environmental conditions, e. g. Unicellular organisms that divide through binary fission to create new daughter cells. Speeds up evolution to combine helpful mutations at multiple loci. Dioecious male or female (cannot be both in one individual: e. g. humans, ash trees. Simultaneous both sexes at the same time (reproductive parts for both sexes on same individual) Sequential start off one sex and then transform (due to environment, better success etc. ) into another sex.
