Biology by Richa
Thursday, 3 October 2013
Wednesday, 18 September 2013
Biology (XII )
GENETICS
1. (a) How many alleles are involved in the inheritance of
blood group in humans?
(b) There is a boy
with blood group A, whose mother has blood group B. Give the possible
genotype(s) and phenotype(s)
of the father.
2. A woman with blood group O married a man with AB group.
Show the possible blood groups of progeny. List the alleles
involved in this inheritance.
3. Why Mendel selected pea plant for genetic research?
4. Why is Mendel considered as the father of Genetics?
5. Give the genotypic and phenotypic ratios of the F1
generation, when a hybrid tall (Tt) pea plant is crossed with pure
dwarf (tt) pea plant.
6. A particular garden pea plant produces only violet
flowers.
(a) Is it homozygous
dominant for the trait or heterozygous ?
(b) How would you
ensure its genotype ? Explain with the help of crosses.
7.(i) Why are grasshopper and Drosophila said to show male
heterogamity ? Explain.
(ii) Explain female
heterogamity with the help of an example.
8. Explain the sex determination mechanism in humans.How is
it different in birds?
9. Briefly describe incomplete dominance with an example.
10. Describe the mechanism of pattern of inheritance of ABO
blood groups in humans?
11.(a)Why is haemophilia generally observed in human
males?Explain the conditions under which a human female
behaemophillic.
(b) A pregnant
human female was advised to undergo M.T.P. It was diagnosed by her doctor that
the foetus she is carrying
has developed from a zygote formed by an XX-egg fertilized
by Y-carrying sperm.Why was she advised to undergo M.T.P.?
12. Why is haemophilia generally occurs in male not in
female?
13. Differentiate b/w
(a) DNA and RNA.
(b) EXON and INTRON
(c) TRANSCRIPTION
and TRANSLATION
(d) TEMPLATE STRAND
and CODING STRAND
14.Why human genome project is called a mega project?
15.HOw is hnRNA converted into mRNA?
BY
RICHA GUPTA
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