Unformatted text preview: zero???? One answer: genetic correlations. Due to the linkage of genes along chromosomes (or epistatic interactions among genes) selection of one trait can lead to selection for another trait. If a viability gene is linked between genes for bristle number, selection for high bristle number could lead to low viability if the low viability allele became associated with the high oil content alleles. If this were the case, there would b a negative genetic correlation between bristle number and viability. As it turns out, many fitness related traits have negative genetic correlations (e.g., size of eggs negatively correlated with number of eggs). Thus if fitness determines selection differential, selection in natural populations could not remove all the additive genetic variation for two fitness traits that are negatively correlated....
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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