CHAPTER-5 : PRINCIPLES OF
INHERITANCE AND VARIATION
Multiple Choice Questions- If the factors responsible for pod shape and pod colour in
a pea plant studied by Mendel, to show inheritance of two
genes, were located closely on same chromosome, then
which of the following would not have been explained?
(a) Law of dominance
(b) Law of segregation
(c) Law of independent assortment
(d) Both (b) and (c) - When two homozygous black and white andalusian fowls
were crossed, the F 1 individuals appeared blue and on
selfing produces black, blue and white fowl in the ratio of
1 : 2 : 1. This is an example of
(a) dominance (b) incomplete dominance
(c) co-dominance (d) pleiotropism. - If a cross between two individuals produces offspring with
50% dominant character (A) and 50% recessive character
(a), the genotypes of parents are
(a) Aa × Aa (b) Aa × aa
(c) AA × aa (d) AA × Aa. - The F 2 ratio in a dihybrid cross is modified from 9 : 3 : 3 : 1
to 9 : 7. This is due to the effect of
(a) duplicate genes
(b) complementary genes
(c) supplementary genes
(d) epistatic genes.- Due to non-disjunction of chromosomes during spermato-
genesis, some sperms carry both sex chromosomes
(22A + XY) and some sperms do not carry any sex
chromosomes (22A + 0). If these sperms fertilise normal
eggs (22A + X), what types of genetic disorders appear
among the offspring?
(a) Klinefelter’s syndrome and Turner’s syndrome respectively
(b) Turner’s syndrome and Klinefelter’s syndrome respectively
(c) Down’s syndrome and Turner’s syndrome respectively
(d) Cri-du-chat syndrome and Down’s syndrome respectively - Which of the following statements is not true for two genes
that show 50% recombination frequency?
(a) The genes show independent assortment.
(b) The genes if present on same chromosome, undergo
more than one crossovers in every meiosis.
(c) Genes may be present on different chromosomes.
(d) The genes are tightly linked. - Genic ratio between X chromosomes and autosomes in
three Drosophila were reported as follows:
P. X
A= 1 Q.
X
A> 1 R.X
A= 05.Based upon the genic ratio, deduce the sex of these insects.Maximise your chance of success in NEET by reading this article. This section is specially designed to optimise your preparation
by practising more and more. It is a unit wise series having chapterwise question bank, allowing you to prepare systematically
and become more competent.
Recall question or single concept question – indicated by a single nger.
Application question or question which requires 2 or 3 concepts - indicated by 2 ngers.
Application question or question which requires 3 or more concepts - indicated by 3 ngers.UNIT-VII : GENETICS AND EVOLUTION