HL 2 Biology

D.4: Hardy-Weinberg Equilibrium

p.131

D3

a) Frequency of sickle cell allele:

  • Genotype Hbs
  • If q=frequency of bs allele, q2= 0.053 so q= 0.230
  • If p= frequency of H allele, p= (1-q)=0.770

b) Percentage of population that are carriers of sickle cell allele

  • 2pq = 2(0.77*0.23)= 0.3542= 35%

c) The high frequency of the sickle cell allele in these ethic groups, despite the serious consequences of sickle cell anemia is present as the those who are carriers began to adapt and become resistant to other diseases, such as malaria. As these carriers become resistant and stronger to surviving other diseases than those with homozygous dominant alleles, the frequency of the alleles increases. Thus, this protective factor enables the high frequency of people with sickle cell allele to have a stronger surviving rate.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s