An allele d is maintained at a low allele frequency in a diploid population for many generations, even though it causes a genetic disease that is 100% lethal when present in two copies (i.e. the dd genotype). After further study, you find that individuals with one copy of this allele and one copy of the wild-type allele D have resistance to a disease that normally kills 20% of the population each generation. Based on this information, this is probably an example of (pick one): Evolution trending towards perfection over time Maintenance of a lethal allele by Heterozygote Advantage Maintenance of a lethal allele by mutation-selection balance Maintenance of a lethal allele by source-sink dynamics
Added by Jose Antonio W.
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Step 1: The allele d is maintained at a low frequency in the population because individuals with one copy of the allele d and one copy of the wild-type allele D have resistance to a disease that normally kills 20% of the population each generation. Show more…
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There are five conditions to achieve the Hardy-Weinberg equilibrium. Which of the conditions is mainly caused by environmental factors? Mutation Migration Random mating Natural selection Which human genetic condition can be estimated through the Hardy-Weinberg equation? Turner syndrome Sex Down syndrome Thalasemia Number of individuals is important in a population. Why? Big changes in allele frequencies of a large population impact less on the next generation. Death of individuals in a small population changes the allele frequencies in the next generation. How does migration influence allele frequencies? Contributing new alleles Changing the number of individuals Changing the mode of reproduction Recessive allele frequencies are calculated first. Why? Genotype of homozygous recessive allele is expressed Recessive alleles are small in numbers Easier to be calculated than the dominant alleles
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