In human population A, hitchhiker's thumb is a simple Mendelian trait. For this trait, N is the dominant allele and n is the recessive allele. Individuals who are homozygous dominant (NN) or heterozygous (Nn) express nonhitchhiker's thumbs. Individuals who are homozygous recessive (nn) express hitchhiker's thumbs. In this population, 90% (0.9) of the alleles are dominant (N) and 10% (0.1) are recessive (n). • Use the Hardy-Weinberg equation to determine the genotype frequencies we should expect in the next generation. Show your work for your answer. • You have collected data on the observed genotype frequencies of the next generation. They are 70% NN, 20% Nn, and 10% nn. Based on these observations and your expectations, is this trait currently evolving in this population? Why or why not
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
In human population A, hitchhiker's thumb is a simple Mendelian trait. For this trait, N is the dominant allele and n is the recessive allele. Individuals who are homozygous dominant (NN) or heterozygous (Nn) express nonhitchhiker's thumbs. Individuals who are homozygous recessive (nn) express hitchhiker's thumbs. In this population, 90% (0.9) of the alleles are dominant (N) and 10% (0.1) are recessive (n).
• Use the Hardy-Weinberg equation to determine the genotype frequencies we should expect in the next generation. Show your work for your answer.
• You have collected data on the observed genotype frequencies of the next generation. They are 70% NN, 20% Nn, and 10% nn. Based on these observations and your expectations, is this trait currently evolving in this population? Why or why not?
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