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Unformatted text preview: Examples of selection at different hierarchical levels: Genic selection is selection at the gene level; best example is meiotic drive (segregation distortion) where one gametic type (often one chromosomal type) is transmitted into the gamete pool (or next generation) in excess (or deficiency). The T locus in mice: affects tail length but also viability. TT homozygotes have normal long tails; Tt heterozygotes have short tails and transmit ~ 90% of the t allele to their sperm; tt homozygotes are sterile. Meiotic drive will increase frequency of t allele to point where that become frequent enough to occur as tt homozygotes with appreciable frequency, whereupon selection works against t alleles. Opposite Selection at two levels selection for at the level of the gene; against at the level of the genotype (organism)....
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This note was uploaded on 11/05/2011 for the course BIOLOGY MCB2010 taught by Professor Jessicadigirolamo during the Fall '10 term at Broward College.
- Fall '10