- Which of the following genotypes of man shows
presence of one Barr body?
(a) XY (b) XXXY
(c) XXY (d) All of these - Which of the following is not a X-linked recessive
disease?
(a) Haemophilia
(b) Colour blindness
(c) b-thalassaemia
(d) Glucose-6-phosphate dehydrogenase deficiency - Haemophilia is a genetic disorder, in which
(a) blood fails to coagulate after an injury
(b) there is delayed coagulation of blood
(c) blood clots in blood vessels
(d) blood cell count falls. - Given diagram shows a pair of homologous
chromosomes during meiosis.
Maximum crossing over will occur between genes
(a) A and a, D and d (b) C and d, c and D
(c) B and c, b and C (d) A and d, a and D.
- Wife is PTC non-taster and husband is PTC taster. Their
son is taster but daughters are non-tasters. This is not
a sex linked trait. Which pedigree is correct?
(a) (b)(c) (d)- The given Punnett’s square represents the pattern of
inheritance in a dihybrid cross where yellow (Y) and
round (R) seed condition is dominant over white (y)
and wrinkled (r) seed condition.
YR Yr yR yr
YR F J N R
Yr G K O S
yR H L P T
yr I M Q UA plant of type ‘H’ will produce seeds with the
genotype identical to seeds produced by the plants
of
(a) Type M
(b) Type J
(c) Type P
(d) Type N.- A man having the genotype EEFfGgHH can produce P
number of genetically different sperms, and a woman
of genotype IiLLMmNn can generate Q number of
genetically different eggs. Determine the values of P
and Q.
(a) P = 4, Q = 4
(b) P = 4, Q = 8
(c) P = 8, Q = 4
(d) P = 8, Q = 8
True or False - When IA and IB are present together, and both of
them express their own types of proteins, it is called
co-dominance. - Pedigree analysis provides a strong tool, which is
utilized to trace the inheritance of a specific person. - Point mutations are commonly observed in cancer
cells. - Female butterflies have one Z and one W chromosome,
whereas the males have a pair of Z chromosomes,
besides the autosomes. - Deletions and insertions of base pairs of DNA cause
frame-shift mutations. - Sickle cell anaemia is caused by substitution of valine
(Val) by glutamic acid (Glu) at the sixth position of
alpha globin chain of haemoglobin. - Physical, psychomotor and mental development is
retarded in individuals suffering from trisomy of 21st
chromosome. - Heterozygotes always express a phenotype which
is a blend of both the homozygous parental
phenotypes. - Punnett square is a graphical representation to
calculate probability of all possible genotypes of
offspring. - Mendel’s approach of using mathematics to
explain biological phenomena was totally new and
acceptable to most biologists.