Short Answer TypeWith the help of any two suitable examples explain the effect of anthropogenic actions on organic evolution.
(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.
(a) ABO blood group is considered a good example of multiple alleles as it is controlled by I gene which has 3 alleles IA, IB and i. The three alleles govern the same character and hence show multiple allelism.
(b) Homozygous mother having blood group A will have a genotype of- IAIA
Homozygous father having blood group B will have a genotype of- IBIB
A cross between
Thus the progeny will havethe blood group AB (genotype IAIB) as the alleles A and B are co-dominant to each other that is they express themselves independently even in the presence of other. Thus the progeny resembles both the parents. The pattern of inheritance is called co-dominance pattern of inheritance.
Describe the structure of a RNA polynucleotide chain having four different types of nucleotides.
Differentiate between inbreeding and outbreeding in cattle. State one advantage and one disadvantage for each one of them.
(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 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.
Explain mutualism with the help of any two examples. How is it different from commensalism?
Long Answer Type(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.
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