Answer:
Frequency of the allele "r"causing the disease on Tristan da Cunha
%
Frequency of the allele "r"causing the disease in the original population of 15 colonists
%
Explanation:
Frequency of the allele "r"causing the disease on Tristan da Cunha
Given -
Out of 240 descendants on the island, 4 had retinitis pigmentosa (rr).
As per Hardy Weinberg's equllibrium equation
The frequecy of recessive individual in a given population is represented by 
And q represents the frequency of allele r
So, in this case q is equal to

%
Frequency of the allele "r"causing the disease in the original population of 15 colonists
As it is given in the question statement , the frequency of allele "r"causing the disease in the original population of 15 colonists is ten times the frequency of the allele "r"causing the disease on Tristan da Cunha
i.e

%
Answer:
The living things in order to maintain is homeostasis
As the question is incomplete i have added the complete question in ask for detail section.
Answer:
The correct options are:
A-C-E-G-I
A-C-E-I
A-C-G-I
Explanation:
Alternative splicing of RNA produces many mRNA strands from primary RNA transcript. When alternative splicing of RNA occurs, all the introns and some exons are removed. The removal of these exons produces different mRNA strands which are then translated into diffident kinds of proteins. Alternative splicing of RNA can highly increase the number of new produced proteins from same gene.
Answer:
Instable behavior.
Explanation:
The checkpoints currently behaving instable in sally cancer cells because mutants show genetic instability so this instability is the cause of cancer disease. Two checkpoints are sensitive to DNA damage, one occur before mitosis cell division and the other occur before replication of DNA. So damage occur in these two check points leads to instable behavior of cancer cells.
Carbon dioxide is what humans exhale, giving trees carbon dioxide will produce oxygen