What three processes can inw gha*c iz0 l*9vd,2ca3xz(ir crease variation in a population?

  Which of the following statement(s) are possible cs0ai*w 1xf x;gonsequences to a polypeptide if a base substitution mut;afg*x0 s1wxi ation occurs?
I. A shorter polypeptide chain is translated
II. An altered polypeptide chain is translated
III. There is no change to the polypeptide sequence

  The DNA sequence shown has been taken from exon 1sws/ ymbeq fd4-(me- / of DNA within the human insulin gene. Which sequence corresponds to a deletion mutation in the sequenf4 yb-mqe es/dsm(w/ -ce?

  What is a possible cause of a genetic mutati7:kefnxryp77 6 gv- elon?

  In species that do not carry out s tm 8g0yrm qeq)7un+pvav4s*4exual reproduction, what is a possible cause of variatq*a44mmvtq v7 nespy0gru ) +8ion?

  Shown below is the single base substitution mutation that causes sickle cell au27 fxp 4ei xe( ,jj6mdu1,icbnaemia in individuals who are homozygous for the allele. ,i(mx7pe f x6bui241jjeu,cd Which of the following is a result of this mutation?

  Which statement about mutations in germ and/or somatic cel4r w80h bct3 o(wf*nqv4bi 4mmls is correct?

  This table is a short section of the gy)thtr 4qpbo-f*yc7 1hu/ / ooutput from a DNA sequence database comparing the cytochrome C y/cogot/* r f7htqpu4bh)y1- gene sequence in two species. What does it show?

  A population of plants with no resistn 2yr 4im5sas9ance to herbivores may develop into a population of plants that secrete a compound toxic to hmy2s4n5rsa 9i erbivores. How could this change occur?

Different species of living organisms have different n 4(ndgxqti7 ek )2dyv:umbers of genes characteristic to them. The table shows the estimated number of genes for k )vy:id eq2n7gtd(4xfive species.
Species Estimated number of genes
Escherichia coli (bacteria species) 4,000
Drosophila melanogaster (fruit fly) 13,000
Canis lupis familiaris (dog) 20,000
Homo sapiens (humans) 30,000
Oryza sativa (rice) 40,000
1.Using the information in the table deduce the estimated number of loci in a human genome.

2.Explain how a mutation can affect a characteristic.

1.Outline the outcomes of thdbm5gi 9,:zhvva *ln.e Human Genome Project (HGP).

2.Variation sometimes refers to the differences between individuals of the same species. Describe the role of genes in variation.

3.The frequency of the sickle cell allele is higher in regions of the world where malaria is prevalent. Explain the cause of sickle cell anaemia and the correlation between the frequency of the sickle cell allele and the prevalence of malaria.

1.Describe how a mutatiolp2-duf9 p:w qn may be a silent mutation.

2.Outline five causes of gene mutations.

3.Compare and contrast the consequences of mutations in somatic and germ cells.