The Scientific Bases for the Preservation of the Hawaiian Crow (1992) / Chapter Skim
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3 GENETIC CONSIDERATIONS
3 GENETIC CONSIDERATIONS
Pages 45-49
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From page 45... ...
Natural selection is not a process that merely eliminates the "bad." The system is not mysterious. Indeed, practical animal and plant breeders used the same system to select animals and plants long before modern knowledge of genetics emerged.
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From page 46... ...
Such deleterious genes commonly exist in heterozygous form. When genetic recombination occurs as two carrier parents are producing offspring, He probability increases that one or more of the progeny win get a double dose of (i.e., become homozygous for)
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From page 47... ...
(1966) compared reproductive performance in purposely inbred lines and normally outbred lines and determined that successive full-sibling matings led to considerable inbreeding depression in all traits that were considered.
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From page 48... ...
Only a single small breeding population, on the McCandless Ranch, appears to survive. This persistent pattern of decline suggests Hat the historical levels of genetic variation might have been progressively eroded as a result of genetic drift and inbreeding.
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From page 49... ...
cannot be recommended. It is clear that the preservation of genetic diversity in both the captive and wild populations will require that both populations be increased in size as rapidly as possible, and this is best accomplished by improving the reproductive success of both captive and wild crows (Chapter 6)
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