CHAPTER:- INHERITANCE AND VARIATION
MCQS FOR PRACTICE
1.
Genes located at the identical loci of homologous chromosomes are called:
a) Polygenes b) Homozygous
c) Alleles d) Oncogenes
2. The process involving mating of individuals,
more closely related than average of the population to which they belong is
called.
a) Inbreeding b) Interbreeding
c) Hybridization d) Selfing
3.
When the identical gene loci on
homologous chromosomes produce different phenotypes, these gene loci bear:
a) Heterozygous alleles b) Different genes
c) Dominant genes d) homozygous alleles
4.
The external appearance of an individual for any trait or traits is called:
a) Phenocopy
b) Homozygous
c) Phenotype
d) Genotype
5.
Mendel was lucky because the genes for seven characters selected
by him in pea were distributed on seven different chromosomes. This was also one
of the reasons for his success. Now, if two or more of these characters (i.e.
Their genes) were located on the same chromosome, which of the Mendel's Laws
would be affected?
a) Law of dominance
b) Law of independent assortment
c) Law of segregation d) All the three
6.
An offspring with Tt genotype is crossed with an individual with tt genotype.
This is an example of -
a) Test cross b)
Monohybrid cross
c) Inbreeding d) both back & test cross
7.
Which of the Mendel's laws will always prove to be universally true
in all cases?
a) All three laws b) Only the second law
c) 2nd and 3nd laws d) 1st and 2nd laws
8.
The types of gametes produced by a single heterozygous yellow wrinkled pea
plant will be:
a) Yr, yr
b) YR, Yr, yR, yr
c) TR, yR
d) YR, yr
9.
When a dihybrid yellow round pea plant is crossed with one of the parents, the progeny obtained is all yellow
round only. What should be the genotype of the parent?
a) YyRr
b) YYRR
c) YYRr
d) yyrr
10.
When a genetically dwarf pea plant is treated with gibberellin, it becomes
as the genetically tall plant. Suppose this gibberellin treated tall looking
pea plant is crossed with a genetic dwarf pea plant, the progeny will consist:
a) 3 tall: 1 dwarf
b) 2 tall: 2 dwarf
c) All tall only
d) all dwarf only
11.
Which one of the Mendel's laws is likely to be non operative in case of closely linked genes?
a) Law of dominance. b) Law
of segregation.
c) Law of independent assortment
d) None of three
12. How
many different types of gametes can be formed by a pea plant with TtYyRr
genotype?
a) 6
b) 8 c) 4
d) 9
13. In one of the crosses involving pea plants, A
yellow round' was crossed with a 'green- wrinkled'. The progeny showed four
different phenotypes in the ratio of 1:1:1:1 what can be the genotypes of the
two plants respectively?
a) YYRR and yyrr.
b) YyRr and yyrr
c) YYRr and
d) yyrr and YyRr
14. Mendel selected pea plants because:
a) The seeds are
edible
b) They were easily
available.
c) The plants were
cheaper.
d) They were having contrasting forms of
selected characters.
15. If a cross involving a dihybrid produces
a progeny of four different
phenotypes in equal ratios/proportions then it must be a
a) Dihybrid cross’s) Monohybrid test-cross.
c) Dihybrid back cross. d) Dihybrid test cross.
16. How
many different types of gametes can be produced by an individual with YYRRtt
genotype?
a) 8 b) 4 c) 2 d) none
of the above three
17. A genotype 'AAbb' is rightly described
as
a) Heterozygous.
b) Double heterozygous.
c) Double homozygous.
d) Single homozygous.
18.
Which of the following statements are correct?
a) A homozygous always
produces only one type of gametes.
b) Each pair of
heterozygous alleles produces two types of gametes
c) The total number of different types
of gametes that can be produces by a genotype is product of the types
produced by each allelic pair in the genotype
d) All of these.
19. If an individual possesses identical forms of
a gene on identical gene loci of homologous chromosomes, it is described as
a) Homozygous dominant
b) Homozygous
recessive
c) Homozygous
d) Alleles
20. Two
or more alternate forms of gene responsible for the expression of the same
trait and situated on identical gene loci on homozygous chromosomes are
called
a) Heterozygous b)
Homozygous
c) Alleles d)
recessive
21. An individual having dissimilar alleles for a
trait is described as a
a) Heterozygote
b) Hybrid
c) Both a and b
c) None of the above
22. In one of Mendel's experiments, two traits
i.e. seed shape (round and wrinkled) and colour of cotyledons (yellow and
green) were studied. In this experiment, he obtained a progeny showing four
different phenotypes in the ratio of 9:3:3:1. What must be the produced such
type of progeny?
a) RRYY x rryy b) RrYy x RrYy
c) RRyy x rrYY. d) RrYy x rryy.
23. In one of the Mendelian crosses, the progeny
obtained contained four phenotype in following numbers.
I) Yellow Round=2450
ii) Yellow Wrinkled=2550
Iii) Green Round=2550
IV) Green Wrinkled=2450
a) Dihybrid F2
ratio. b) Dihybrid test cross
c) Dihybrid back cross d) both (b) &
(c)
24. The main reason for Mendel' success was that
he:
a) Selected pea plants.
b) Used statistical principles to
analyse the results.
c) Maintained statistical data meticulously.
d) First studied the inheritance pattern
of one character at a time
25. A cross is performed between two pea plants
as follows (TTrrYY x ttRRyy). How many different types of phenotypes will
be produced in the progeny of this cross?
a) 4. b) 8.
c) 2. d) 1.
26. What will be the ratio of different types of
Gametes formed by a pea plant with YyRr?
Genotype?
A) 9:3:3:1. b) 1:1:1:1. c) 3:1 d)1:1
27. A double heterozygous tall and yellow
(cotyledon colour) pea plant is selfed. In the progeny obtained, what will
be the ratio of homozygous dwarf and green offsprings?
a) 1/4 b)
4/16 c) 3/16 d) 1/16
28. In snapdragon, the Red flower colour shows
incomplete dominance over white flower colour. In cross between pure Red and
pure white parents, what will be F2 phenotypic and genotypic genotypic ratios
respectively?
a) Phenotype 3:1/genotype 1:2:1.
b) Phenotype 2:2/genotype 2:2.
c) Phenotype 1:2:1/genotype 1:2:1.
d) Phenotype 3:1/genotype 3:1.
29. An individual produces following types
of
Gametes: (Abc), (Abc), (abc) and (abc), can be possible genotype
of this individual?
a) Aa Bb Cc. b) Aa Bb CC.
c)Aa Bb cc. d)AabbCc.
30. Mendel first published his observation and
conclusions about heredity and variations based
on the breeding expts on pea plants in the year:
a) 1965. b) 1901. c) 1884. d)
1866.
31. "Law of segregation is applicable but
not the law of independent assortment. “This can be possible in case of:
a) Incomplete dominance.
b) A double homozygous recessive
genotype.
c) Linked genes.
d) All the above three
32. Mendel's work was republished in the year:
a) 1900. b) 1884. c) 1901. d)
1866.
33. Mendel selected seven characters (traits) in
pea to study the inheritance pattern which one of the following was not in
his list of the seven traits?
A)Colour of cotyledons. b)Colour of seed coat
c) Colour of pod. d)
Colour of flower
34. In his experiment on pea plants, Mendel performed
some of the crosses as follows:
Male parent Female parent
Cross -l Yellow Round
Green wrinkled
Cross -ll Green wrinkled yellow
Round
Such type of crosses are
called :
a) Test crosses.
b) Back crosses.
c) Reciprocal crosses.
d) Dihybrid crosses.
35. In Mendelian experiments, 1:2:1 ratio
represents the:
a) Dihybrid test cross
ratio.
b) Monohybrid test cross
c) Dihybrid F2
ratio.
d) Monohybrid genotypic ratio
36. All the genes located along the length of a chromosome
represent a:
a)Genome.
b) Gene compliment.
c) Linear genes
d) Linkage group.
37. Chromosomes were discovered by:
a)Strasburger. b) Morgan.
c) Punnett. d) Mendel.
38. The term 'gene' was first coined by:
a) Mendel. b) Johansen.
c) Strasburger. d) Griffith
39. The law of purity of gametes is also known as the
a) Law of dominance.
b) Law of segregation.
c) Law of independent
assortment.
d) None of the above
40. A tall pea plat with round seeds was crossed with
a
a)9:3:3:1. b)All
tall and round.
c)1:1:1:1. d) b or c
41. A double homozygous tall pea plant with green
cotyledons is crossed with a pure dwarf plant with yellow cotyledons. The
offsprings are
then crossed with dwarf and green pea plant. How many different types of
phenotypes will be obtained in the resulting progeny?
a) 1. b) 2. c) 4. d)
16.
42. The
genotypic and phenotypic ratio are identical in case of:
a) Incomplete
dominance.
b) Monohybrid test cross
c) Dihybrid test
cross.
d) All of these.
43. If a tall pea plant is crossed with a dwarf
pea plant, which of the following results can be possible in progeny obtained?
a) All tall plants.
b) 1:1 phenotypic and genotypic
ratio.
c) 3:1 phenotypic ratio.
d) Both a and b.
44. If two pea plants, both with yellow cotyledon
and round seeds are crossed, which of the following results can be possible?
a) All yellow round
only.
b) 12/16 yellow: 12/16 round
C) 9:3:3:1 ratio. d) All of these
45. In one of the Mendelian experiments, a pure
round seeded pea plant was crossed with a pure wrinkled seeded plant. In
the F2 generation of this cross, what will be the ratio of pure round: pure
wrinkled?
a) 3:1. b) 1:1. c) 2:2.
d) 2:1
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