Hardy-Weinberg Problems

 

     1. In Drosophilia, the allele for normal length wings is dominant over the allele for vestigial wings. In a population of 1,000 individuals, 360 show the

     recessive phenotype. How many individuals would you expect to be homozygous dominant and heterozygous for this trait?

 

     

 

     

 

     

 

     

 

     2. The allele for the ability to roll one's tongue is dominant over the allele for the lack of this ability. In a population of 500 individuals, 25% show the

     recessive phenotype. How many individuals would you expect to be homozygous dominant and heterozygous for this trait?

 

     

 

     

 

     

 

     

 

     3. The allele for the hair pattern called "widow's peak" is dominant over the allele for no "widow's peak." In a population of 1,000 individuals, 510

     show the dominant phenotype. How many individuals would you expect of each of the possible three genotypes for this trait?

 

     

 

     

 

     

 

     

 

     4. In a certain population, the dominant phenotype of a certain trait occurs 91 % of the time. What is the frequency of the dominant allele?

 

     

 

     

 

     5. Calculate the allele frequencies for a population of the following numbers of individuals: 155 TT, 220 Tt, and 450 tt.

 

     

 

     

 

     

 

     

 

     6. If the allele frequency for "t " is 0.84 , what is the allele frequency for " T " ?

 

     

 

     

 

     

 

     7. Hardy-Weinberg equilibrium is reached if there is no migration. Movement of alleles in and out of a population is called

     ___________________________.

 

     

 

     8. Random variations in the allele frequencies due to chance is called _________________.

 

     

 

     9. Why are many endangered or threatened species at risk due to genetic drift ?

 

     

 

     

 

     

 

     10. Explain what it means for a population to in in Hardy - Weinberg equilibrium.