Answer: If a red blood cell is place in hypertonic solution this will make water to move out of the cell(solute of greater concentration), the cell will shrink,it contented may become concentrated and may die.
Explanation:
Hypertonic solution is a solution that have higher concentration of solutes compared to hypotonic and isotonic solution. Hypertonic solution contains more dissolved particles like salt and electrolytes. When a cell is placed in it, the high concentration of the solutes will make water to leave the cell and the cell will shrink.
Answer:
Allele frequency
Normal allele 
Mutant r allele 
Genotype frequency
Homozygous normal bugs 
Homozygous mutant bug 
Heterozygous normal bug with one mutant r allele and one normal allele 
Explanation:
It is given that 99% of the bugs were killed after the spray of pyrethrum. This suggests that 1% of the bugs that were not killed must be homozygous for the mutant type allele "r"
Thus, the frequency of homozygous "rr" species i.e 
From this we can evaluate the frequency of mutant "r" allele.
Thus, 

As per Hardy-Weinberg first equilibrium equation, 
Substituting the value of q in above equation, we get

Thus, the frequency of homozygous normal bug is equal to

As per Hardy-Weinberg second equilibrium equation-

Substituting all the available values we get -

Allele frequency
Normal allele 
Mutant r allele 
Genotype frequency
Homozygous normal bugs 
Homozygous mutant bug 
Heterozygous normal bug with one mutant r allele and one normal allele 
Answer:
The climate might have changed and it rained more
Explanation: