Biology chapter 22
CHAPTER
22 BIOLOGY
1)
How many pairs of homologous chromosomes are
present in pisum sativum
a) five pairs b) six pairs
c) seven pairs d) eight pairs
2)
Which of the following characters of pea plant
is dominant
a) Axial flowers b) Terminal flower
c) White flowers d) None of these
3)
Filial is a Latin word. It means
a) spring b) issue
c) progeny d) descendent
4)
Which of the following condition is hybrid
a) TT b) Tt c) tt d) All of these
5)
Which of the following is mono hybrid cross
a) TT x tt b) TTYy x Ttyy
c) Both of these d) None of these
6)
A pure breeding tall plant was crossed to dwarf
plant. What would be probability of “Tt” genotype in F2
a) 0.25 b) 0.50 c) 0.75 d) None of these
7)
If a heterozygous individual shows the effect of
both alleles, the type of inheritance would be
a) complete dominance b) non dominance
c) incomplete dominance d) none of these
8)
The gene which controls ABO group has how many
alleles
a) one b) two c) three d) four
9)
The gene which controls Rh blood groups has how
many alleles
a) one b) two c)
three d) four
10)
The trait “Kernel colour in corn” is controlled
by how many pairs of genes
a) one pair b) two pairs
c) three pairs d) many pairs
11)
The gene which do not follow law of independent
assortment
a) crossed genes b) linked genes
c) recessive genes d) none
12)
During test cross, if all offsprings are
phenotypically dominant then parents are
a) homozygous b) heterozygous
c) one homozygous other heterozygous d) none
of these
13)
Genotype ratio of Mendel’s law of independent
assortment is
a) 3:1 b) 1:2:1 c) 9:3:3:1 d) none of these
14)
Which of the following is universal donor
a) A b) B c) AB d) O
15)
Which of the following blood group is always
heterozygous
a) A b) B c) AB d) O
16)
All the genes / alleles found in a breeding
population at a given time are collectively called
a) Gene pool b) Genotype
c) Gene frequency d) Genetic
drift
17)
A trait that had two clear-cut alternative forms
is called
a) True breeding b) contrasting
c) dominant d) recessive
18)
The trait that appears in F1 is
called
a) Dominant b) Recessive
c) Both d) All of these
19)
F2 generation of a monohybrid cross
yields the offspring in genotypic ratio of
a) 3:1 b) 1:1 c) 1:2:1 d) 1:3:1
20)
The gametes of parents having the genotype RrAA
should be as
a) RA, Ra b) ra , ra c) RA, rA d) Ra, rA
21)
F2 wrinkled when self-fertilized
produced
a) Round and wrinkled seeds b) Only
round seeds
c) Only wrinkled seeds d) Seeds in between round and wrinkled
22)
Different alleles of a gene that are expressed
in a heterozygous condition are called
a) Complete dominance b) Incomplete
dominance
c) Co-dominance d) Over
dominance
23)
No antigen is found in the blood of person
having the blood group
a) A b) B c) AB d)
O
24)
The persons having blood group “AB” are known as
a) Universal donors b) Universal recipients
c) Both a and b d) None
25)
Which of the following statements is not correct
for erythroblastis foetalis?
a)
It is because of incompatibility of Rh factor
b)
The first pregnancy may not suffer from the disease
c)
It is used to as an evidence for disputed paternity
d)
A baby born with the disease would suffer from jaundice
and anemia.
26)
The inheritance of the continuously varying
traits is called
a) Digenic inheritance b) Polygenic inheritance
c) Monogenic inheritance d) Variable
inheritance
27)
Which
phenomenon reduces the chances of genetic recombination and variations among
offspring?
a) Linkage b) Crossing
over
c) Independent assortment d) Dominance
28)
Who first time found white eye mutant in
Drosophila?
a) Morgan b) Bridges
c) Correns d) de
Vries
29)
The number of autosomes in human beings is
a) 46 b) 45
c) 44 d) 42
30)
Which of these traits zigzags from maternal
grandfather through a carrier daughter to grandson?
a) Autosomal b) X-linked
c) Y-linked d) Both
X- & Y-linked
31)
Which of the following traits is not sex linked
recessive?
a) Haemophilia b) Hypophosphatemic
rickets
c) tfm syndrome d) colour
blindness
32)
Which one of the following phenotypic features
of Man can be affected only by the genotype?
a) height b) intelligence
c) skin colour d) number
of different blood group antigens
33)
Which one of the following is an example of
discontinuous variation in humans?
a) height b) intelligence
c) skin colour d) ABO
system of blood groups
34)
A linkage group is composed of genes which
a)
associate during prophase I
b)
are in the same nucleus
c)
segregate at mitosis
d)
are situated on the same chromosome
35)
A woman with normal colour vision, whose father
was red-green colour blind, married a red-green colour blind man. What is the
probability of her first-born child being red-green colour blind?
a) 0.50 b) 0.75
c) 0.25 d) 0.66
36)
Which of the following would cause phenotypic
variation among organisms of the same genotype?
a)
continuous variation within the species
b)
different varieties of the same species
c)
different sexes
d)
exposure to different environments
37)
In the F2 generation of a dihybrid cross, the
phenotypes occurred in the ratio 3:1. What does this result indicate?
a)
the alleles were segregating independently
b)
polygenic inheritance was involved
c)
codominance was being shown
d)
the gene loci were linked
38)
Why does haemophilia usually affect only males,
although females may carry the gene responsible for the disease?
a)
The gene is inactive in the female
b)
The gene is dominant only in males
c)
The gene is carried on the X chromosome
d)
The gene is carried on the Y chromosome
39)
The genotype of a human zygote will differ from
that of both parents. Which of the following does not contribute to this
variation?
a)
Chiasmata occurring during meiosis
b)
Mutation of genes
c)
Presence of dominant genes
d)
Random combination of gametes
40)
Which of the following increases the number of
different alleles in a population?
a) crossing over b) gene
mutation
c)
random fusion of gametes
d)
reassortment of chromosomes in meiosis
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