The Allen's and Bergmann's rule can help to explain variation between regional populations for which of the following phenotypes? Group of answer choices Nose form Stature (height) Milk sugar digestion Skin, hair and eye color Intelligence

Consider the disease phenylketonuria (PKU), which is an autosomal recessive defect in the enzyme phenylalanine hydroxylase. The absence of the enzyme prevents phenylalanine from being metabolized causing unusually high levels of phenylalanine in the body leading to severe mental retardation. The selection coefficient for the recessive homozygous individuals is 0.7 and the frequency of the recessive allele in the population is 1.0 x 10-2.  If PKU is maintained by mutation-selection balance what is the predicted mutation rate?  The actual mutation rate is 1 X 10-4. What other mechanism might be affecting the allele frequency?

A population is made up of individuals where 77 have the A1A1 genotype, 65 have the A1 A2 genotype, and 123 have the A2A2 genotype. What is the allele frequency of A1? Answer to 2 decimal places.

Which of the following is an example of environmental impacts on the expression of traits?   Heterozygous individuals of a plant species have pink flowers, whereas homozygous individuals have either red or white flowers.   An individual’s blood type depends on the interaction of the alleles A, B, or O.   Animal coat color shifts in response to seasonal changes in day length and temperature.

The two question below are confusing

Given the following observed genotype frequencies (AA 0.45, Aa 0.16 and aa 0.39) for a gene that determines coat color with incomplete dominance in a population of lemmings.  Allele "A" results in a dark colored coat.  Allele "a" results in a light colored coat.  What percent of the population would possess a dark coat as their phenotype?

The ability to roll your tongue is a dominant trait that Alfred Sturtevant observed in 72% of people in a population study. What is the allele frequency of the tongue rolling allele?