(a) Why are transgenic animals so called?
(b) Explain the role of transgenic animals in
(i) Vaccine safety
(ii) Biological products with the help of an example each.
(a) Transgenic animals are so called because they have their DNA manipulated and thus they possess and express foreign gene.
(b) Role of transgenic animals in :
(i) Vaccine safety
Transgenic mice are being developed and used to test the safety of the vaccine before they are used on humans.
(ii) Biological products
Transgenic animals are developed and their genes are manipulated so that they produce certain biological products which are expensive to make. e.g. The first transgenic cow Rosie produced milk which had human alpha-lactalbumin.
(a) Draw a diagrammatic sectional view of a mature anatropous ovule and label the following parts in it:
(i) that develops into seed coat.
(ii) that develops into an embryo after fertilization.
(iii) that develops into an endosperm in an albuminous seed.
(iv) through which the pollen tube grains entry into the embryo sac.
(v) that attaches the ovule to the placenta.
(b) Describe the characteristic features of wind pollinated flowers.(a) Why are the fruit juices bought from market clearer as compared to those made at home?
(b) Name the bioactive molecules produced by Trichoderma polysporum and Monascus purpureus.
(a) Why is human ABO blood group gene considered a good example of multiple alleles?
(b) Work out a cross up to F1 generation only, between a mother with blood group A (Homozygous) and the father with blood group B (Homozygous). Explain the pattern of inheritance exhibited.
Explain mutualism with the help of any two examples. How is it different from commensalism?
Differentiate between inbreeding and outbreeding in cattle. State one advantage and one disadvantage for each one of them.
With the help of any two suitable examples explain the effect of anthropogenic actions on organic evolution.
Describe the structure of a RNA polynucleotide chain having four different types of nucleotides.
