Question

12) A particular allele of a gene (including the wild-type allele) can be expressed in a dominant fashion for several reasons- A) Explain why wild-type alleles are usually dominant to mutant alleles (5 pts.). B) Describe three ways in which mutant alleles can be dominant to a wild-type allele (6 pts.). 13) Explain how chromatids/chromosomes move to opposite poles of the cell during anaphase. Be sure to mention in your answer how the force that propels this movement is generated (4 pts.).

Answer 1

12 A: Wild Type allele refers to the phenotype of the typical form of a species as it occurs in nature.Originally the wild type was conceptualized as a product of standard "normal" allele at a locus,in contrast to that produced by a non saturated,"mutant" allele.Mutant alleles can vary to a great extent and even become wild type if a genetic shift occurs within the population.In many specie,the most common allele in the wild population is designated the wild type allele.It is symbolised with a +character as a superscrip.Other allelles are dominant or recessive to the wild type allele.Mutant alleles are usually recessive mutatioin to give rise to a mutant phenotype in a diploid organism,both alleles must carry the mutation.This copy of dominant mutant allele leads to mutant phenotype.