The first rule of any reconstruction or prediction of evolution is that the phenotypic variation must be heritable. … One of the most important findings in evolutionary genetics has been the discovery of substantial genetic variation underlying characters that show no morphological variation!
What type of variation is heritable?
In fact, heritability is formally defined as the proportion of phenotypic variation (VP) that is due to variation in genetic values (VG). Genotypes or genotypic values are not passed on from parents to progeny; rather, it is the alleles at the loci that influence the traits that are passed on.
Is phenotypic plasticity heritable?
Previous studies have shown that phenotypic plasticity is a heritable trait which varies among populations and species (Schlicht- ing, 1986). … Knowing the heritability is important if we are to make predictions about the response of a population to environmental variation.
Which of the following is the best example of heritable variation?
Which of the following is the best example of a heritable variation? The answer is: red hair.
Can phenotypic plasticity lead to evolution?
For instance, although it is generally acknowledged that phenotypic plasticity can increase organism survival under specific conditions, there is no general agreement on whether plasticity can drive the evolution of novel traits and promote taxonomic diversity, or on whether it has more often the effect of accelerating …
What causes phenotypic plasticity?
Rather, phenotypic plasticity is a developmental process, and the reaction norms that we usually measure in the adult stage, or at reproductive maturity, are in fact the result of a positive feedback between environments and genes throughout the ontogeny of an organism (Schmalhausen, 1949; Smith-Gill, 1983; Pigliucci …
What are the 3 types of phenotypes?
With one locus and additive effects we have three phenotypic classes: AA, Aa and aa.
Is behavior a phenotype?
The term “phenotype” refers to the observable physical properties of an organism; these include the organism’s appearance, development, and behavior.
Is skin color a phenotype?
Skin color variation is one of the most striking examples of human phenotypic diversity. It is dominated by melanin, a pigmentation located in the base of the epidermis and produced by melanocytes. Melanin has two forms, pheomelanin (yellow-reddish) and eumelanin (black-brown).