- Pattern baldness, moustaches and beard in human males are
examples of
(a) sex linked traits
(b) sex limited traits
(c) sex influenced traits
(d) sex determining traits. - Haemophilia is more commonly seen in human males than
in human females because
(a) a greater proportion of girls die in infancy
(b) this disease is due to a y-linked recessive mutation
(c) this disease is due to an X-linked recessive mutation
(d) this disease is due to an X-linked dominant mutation. - The distance between two genes in a chromosome is
measured in cross over unit, which represent
(a) rate of crossing over that occur between them
(b) number of crossing over that occur between them
(c) percentage of crossing over that occur between them
(d) rate of bivalent formation. - Which of the following shows linkage group in coupling
phase?
(a) (b)
(c) (d)- Which of the following statements is not true of two genes
that show 50% recombination frequency?
(a) The genes show independent assortment.
(b) If the genes are present on the same chromosome, they
undergo more than one cross-overs in every meiosis.
(c) The genes may be present on different chromosomes.
(d) The genes are tightly linked. - Maize has ten pairs of chromosomes. How many linkage
groups will be present, if all the genes are mapped?
(a) 20 (b) 5
(c) 40 (d) 10 - X-chromosomes of female in a sex-linked inheritance case
can be passed on to
(a) only female progeny
(b) only male progeny
(c) only in grand daughter
(d) male and female progeny.
Exam Section
- a pleiotropic gene
(a) controls a trait only in combination with another gene
(b) controls multiple traits in an individual
(c) is expressed only in primitive plants
(d) is a gene evolved during Pliocene.
(AIPMT 2015)
(b) bateson and Punnet, Pisum sativum
(c) Morgan, Drosophila
(d) Sturtevant, Drosphila- Pleiotropy occurs when a gene has
(a) a complementary gene elsewhere
(b) a small effect on one trait
(c) reversible effects on the phenotype, depending on age
(d) many effects on the phenotype. - In Antirrhinum (dog flower), phenotypic ratio in f 2 generation
would be
(a) 3 : 1 (b) 1 : 2 : 1
(c) 1 : 1 (d) 2 : 1. - The most popularly known blood grouping is the abO
grouping. It is named abO and not abC, because “O” in it
refers to having
(a) overdominance of this type on the genes for a and b
types
(b) one antibody only - either anti - a or anti - b on the
rbCs
(c) no antigens a and b on rbCs
(d) other antigens besides a and b on rbCs. - Diseases caused by pleiotropic genes are
(a) syndromes
(b) reversible by diet therapy
(c) reversible by gene therapy
(d) extremely rare. - In sweet pea, genes C and P are necessary for colour in
flowers. The flowers are white in the absence of either or both
the genes. What will be the percentage of coloured flowers
in the offspring of the cross Ccpp × ccPp?
(a) 75% (b) 25%
(c) 100% (d) 50% - a child’s blood group is ‘O’. The parent’s blood groups cannot
be
(a) ab (b) a and b
(c) b and O (d) a and a. - The abO blood grouping in human beings is an example of
(i) Dominance
(ii) Incomplete dominance
(iii) Co-dominance
(iv) Multiple alleles
(a) (i) and (ii) only (b) (ii), (iii) and (iv)
(c) (i), (iii) and (iv) (d) (ii) and (iii) only - There are three genes a, b, c. Percentage of crossing over
between a and b is 20%, b and c is 28% and a and c is 8%.
What is the sequence of genes on chromosome?
(a) b, a, c (b) a, b, c
(c) a, c, b (d) none of these