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17 variations on Mendels Themes Variations on Mendel’s Themes Incomplete Dominance • Appearance of a 3rd Phenotype • The phenotype of the heterozygote is intermediate between the 2 homozygotes • Use uppercase letter and uppercase prime – RR= Red 1 1 – R R = White 1 – RR = Pink Incomplete Dominance R 1R 1 RR X RR1 Incomplete Dominance • Cross 2 pink snapdragons •Phenotypic results •Genotypic results Codominance • Expression of both alleles • The phenotype of the heterozygote shows both phenotypes of the 2 homozygotes • Use 2 different uppercase letters – B for black feather chicken – W for white feather chicken
Typically, phenotypic trends observed in populations are compared with evolutionary predictions based on selection and heritability estimates, for example, using the breeder’s equation (10, 11).
The mechanisms underlying phenotypic plasticity in inducible cold tolerance are complex and not fully understood.
10.1111/j.1365-2435.2011.01898.x Comparing phenotypic effects and molecular correlates of developmental, gradual and rapid cold acclimation responses in Drosophila melanogaster Herve´ Colinet*,1,2,† and Ary A.
8 March 2007 © Springer-Verlag 2007 Abstract The phenotypic eVects of rearing temperature on several Wtness components of the koinobiont parasitoid, Aphidius colemani, were examined.
In conclusion, metabolic signatures markedly changed with age and homeostenosis was observed in the phenotypic response to cold stress.
The analysis separated the riverine and the lake populations of mussels into two morphological groupings, indicating that considerable phenotypic plasticity exists among the populations of the zebra mussel.
Cold storage Parasitoids Low temperature Phenotypic plasticity Fitness a b s t r a c t Storage at low temperature is a valuable method for increasing the shelf-life of natural enemies such as insect parasitoids.