Sib competition theory

Sib competition theory - Sib competition theory states that...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Sib competition theory states that offspring in the next generation will be competing for the same resources and thee genetically identical offspring will experience more severe competition that sexual siblings because the latter will be genetically different and will not utilize resources in identical manners. Supporting evidence from plants where offspring were shown to have higher fitness when grown in competition with different genotype than in competition with its own genotype. Muller's ratchet and recombination . In a strain of asexual species the number of deleterious mutations accumulate with time. The only way to get rid of them is by death. When the genotype with the smallest number of mutations n x dies , the genotype with the smallest number of mutations in now n x+1 and thee "ratchet" has clicked up one notch. With recombination one can mate two genotypes and their offspring might have fewer mutation (and more as well), so variation is generated that can be a higher fitness than any of the existing genotypes. The lower chromosome now has
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.
Ask a homework question - tutors are online