Match The Columns- Match Column-I with Column-II.
Column-I Column-II
A. Male heterogamety (i) 13-Trisomy
B. Patau’s syndrome (ii) Triticale
C. Allopolyploidy (iii) 18-Trisomy
D. Autoallopolyploidy (iv) Drosophila
E. Turner’s syndrome (v) Helianthus
F. Female heterogamety (vi) Monosomy
G. Edward’s syndrome (vii) ZW-ZZ system - Match Column-I with Column-II. (There can be more
than one match for items in Column I).
Column-I Column-II
A. Sex linked disorder (i) Sickle cell anaemia
B. Translocation (ii) Haemophilia
C. Deletion (iii) Turner’s syndrome
D. Autosomal disorder (iv) Ancon sheep
E. Discontinuous (v) Cystic fibrosis
variation
F. Continuous variation (vi) Colour blindness
G. Heteroploidy (vii) Skin colour
(viii) Polydactyly
(ix) Klinefelter’s syndrome
(x) Length of fingers
(xi) Cri-du-chat syndrome
(xii) Chronic myeloid
leukemia
(xiii) Philadelphia
chromosome
(xiv) Intrachromosomal
aberration
passage Based Questions
28.(A) Complete the given passage with appropriate words
or phrases.
(a) The male gametes, in humans, are of two types.
The (22 + X) sperms are called (i) , while (22 + Y)
sperms are called (ii). As Y chromosome determines
male sex of the embryo, it is called (iii).
(b) The (iv) gene on Y chromosome brings about
differentiation of embryonic gonads into testes. In
its absence, gonads differentiate into ovaries after
(v) week of embryonic development, resulting in
female sex, which is therefore called (vi) sex.
(B) Read the given passage and correct the errors,
wherever present.
Morgan observed during oogenesis in a few insects,
a structure called Y body, which was later named
Y chromosome. It is an autosome. Presence of one
extra copy of it in a male individual leads to Turner’s
syndrome.
Assertion & reason
In each of the following questions, a statement of
Assertion (A) is given and a corresponding statement
of Reason (R) is given just below it. Of the statements,
mark the correct answer as :
(a) if both A and R are true and R is the correct explanation
of A
(b) if both A and R are true but R is not the correct
explanation of A
(c) if A is true but R is false
(d) if both A and R are false.- Assertion : Environment easily influences the
phenotypic expression of polygenic inheritance.
Reason : Polygenic inheritance is related to both
quantitative and qualitative inheritance. - Assertion : In F 2 generation of Mendelian crosses, 1/2
the individuals showed genotype of F 1 generation.
Reason : In such crosses, the F 1 individuals incompletely
expressed the dominant trait. - Assertion : Trihybrid cross involves inheritance of three
unit factors controlling three distinct characters.
Reason : The phenotypic trihybrid ratio in F 2 generation
is 27 : 9 : 9 : 9 : 9 : 3 : 3 : 1. - Assertion : The basic principles of inheritance, as
formulated by Mendel are collectively called Mendel’s
principles of inheritance or Mendelism.
Reason : Principle of dominance and the principle
of segregation are Mendel’s first and second laws,
respectively. - Assertion : The F 2 ratio of a Mendelian dihybrid cross
shows two types of recombinants.
Reason : Generally, the alleles of the two different
characters are free to assort and combine, independent
of each other. - Assertion : Radiations occur naturally in the form of
UV rays, as well as ionic radiations from space.
Reason : UV rays produce thiamine dimers, resulting
in mutations.