Author:
GARCÍA-DORADO A.,LÓPEZ-FANJUL C.,CABALLERO A.
Abstract
Recent mutation accumulation results from invertebrate species suggest that mild deleterious
mutation is far less frequent than previously thought, implying smaller expressed mutational loads.
Although the rate (λ) and effect (s) of very slight deleterious mutation remain unknown, most
mutational fitness decline would come from moderately deleterious mutation (s ≈ 0·2, λ ≈ 0·03),
and this situation would not qualitatively change in harsh environments. Estimates of the average
coefficient of dominance (h¯) of non-severe deleterious mutations are controversial. The typical
value of h¯ = 0·4 can be questioned, and a lower estimate (about 0·1) is suggested. Estimated
mutational parameters are remarkably alike for morphological and fitness component traits
(excluding lethals), indicating low mutation rates and moderate mutational effects, with a
distribution generally showing strong negative asymmetry and little leptokurtosis. New mutations
showed considerable genotype–environment interaction. However, the mutational variance of
fitness-component traits due to non-severe detrimental mutations did not increase with
environmental harshness. For morphological traits, a class of predominantly additive mutations
with no detectable effect on fitness and relatively small effect on the trait was identified. This
should be close to that responsible for standing variation in natural populations.
Subject
Genetics,General Medicine
Cited by
94 articles.
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