What three processesorh*/0fcr- a g can increase variation in a population?

  Which of the following statement(s) are possible cons/du)hfkwelt t81 zr ,6equences to a polypeptide if a base substitution mutationl,u fewrh/)z1 t kdt68 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 shownw5ec 7;nou5 pe has been taken from exon 1 of DNA within the human insulin g5wu;p o7e 5necene. Which sequence corresponds to a deletion mutation in the sequence?

  What is a possible cause ovgs n ;x;kr0:if a genetic mutation?

  In species that do not carry9l e0nnq+ flv6 out sexual reproduction, what is a possible cause of variatio09vql6l+nefn n?

  Shown below is the single 78e .l x5pyqfmbase substitution mutation that causes sickle cell anaemia in individuals who are homozygous for the allele. Which of the following is a result of this mutaxem7 q p5lf.y8tion?

  Which statement about mutations if l3yr4vd 2gw.c;c. zu0uho0kn germ and/or somatic cells is correct?

  This table is a short segcu/al2t,udh96*ps c ction of the output from a DNA sequence database comparing the cytochrome C gene seu9p/lach6, udsgt* c2 quence in two species. What does it show?

  A population of plants with no resistance to herbivores maidnh w2cr1yd.b( 8urgzg+ .o )7sfa s/y develop into a population of plants that secrete a compound toxic to herbivores. How could this rh7ruc. 2gwfnd8a+) (g1s zbdiy /s o.change occur?

Different species of living organisms have different numbers oy(ilnf: qm* /if genes characteristic to them. The table shows the estimated number of :nq miif* (yl/genes for five 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 outcom sy15qn 5lk9iek.4 xmves of the 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 mutation may be a silent mutatm4i0 yp5eozpvw02 p8 yb5 pya,ion.

2.Outline five causes of gene mutations.

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