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| the ability of a population to maintain or increase its numbers in succeeding generations |
| natural selection that favors altruistic behavior toward close relatives resulting in an increase in the individual's genetic contribution to the gene pool |
haplosis hap·lo·sis (hāp-lō'sĭs)
n.
Reduction of the diploid number of chromosomes by one half during meiosis, resulting in the haploid number.