Heredity Test

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Heredity Test - 3

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Question 1
1 / -0

Genetics (Gr. Genesis = to grow into), a term coined by Bateson (1906), is the study of

A
heredity

B
variations

C
heredity and variations

D
inheritance and variations

Solution

Genetics, a term coined by Bateson (1906), is the study of heredity and variations. Genetics is the study of genes, heredity, and genetic variation in living organisms.
Question 2
1 / -0

Who is regarded as the father of genetics?

A
T.H. Morgan

B
G.J. Mendel

C
Hugo de Vries

D
Karl Correns

Solution

Gregor Mendel is known as the father of genetics.
Question 3
1 / -0

A cross between hybrid and either parent is called

A
test cross

B
reciprocal cross

C
monohybrid cross

D
back cross

Solution

A cross between hybrid and either parent is called back cross. It is used in horticulture, animal breeding and in production of gene knockout organisms.
Question 4
1 / -0

Mendel failed to produce the same results in plants like

A
hieracium (Hawk weed)

B
bean (Phaseolus)

C
Both (1) and (2)

D
None of these

Solution

Mendel failed to produce the same results in plants like hieracium (Hawk weed) and bean (Phaseolus).
Question 5
1 / -0

Escherichia coli (K₁₂ strain, an inhabitant of intestine) is widely used in genetic research because it is

A
easy to procure

B
easy to handle

C
easy to culture in laboratory

D
easily multiplied

Solution

Escherichia coli (K12 strain, an inhabitant of intestine) is widely used in genetic research because it is easy to culture in laboratory.
Question 6
1 / -0

Law of Independent Assortment of Mendel was proved by

A
monohybrid cross

B
dihybrid cross

C
incomplete dominance

D
back cross

Solution

Independent assortment of genes and their corresponding traits was first observed by Gregor Mendel in 1865 during his studies of genetics in pea plants. He was performing dihybrid crosses, which are crosses between organisms that differ with regard to two traits. He discovered that the combinations of traits in the offspring of his crosses did not always match the combinations of traits in the parental organisms. Thus, Law of Independent Assortment is formulated.
Question 7
1 / -0

From a cross AABb x aaBb, the genotypes AaBB : AaBb : Aabb : aabb are obtained in the ratio

A
1 : 1 : 1 : 1

B
1 : 2 : 1 : 0

C
0 : 3 : 1 : 0

D
1 : 1 : 1 : 0

Solution

From a cross AABb aaBb, the genotypes AaBB : AaBb : Aabb : aabb are obtained in the ratio 1 : 2 : 1 : 0.
Question 8
1 / -0

If the frequency of a dominant phenotype in a stable population is 75%, then the frequency of recessive allele will be

A
25%

B
50%

C
100%

D
10%

Solution

If the frequency of a dominant phenotype in a stable population is 75%, then the frequency of recessive allele will be 25%.
Question 9
1 / -0

Which of the following crosses shows 3 : 1 ratio?

A
AaBb x AaBb

B
aabb x AABb

C
Aabb x Aabb

D
AaBb x aabb

Solution

Aabb x Aabb gives 3 : 1 phenotypic ratio as Aa and bb will be the gametes and offspring will have genetic constitution of AAaa, Aabb, Aabb and bbbb.
Question 10
1 / -0

Alternative forms of the gene are called

A
factors

B
alleles

C
dominant genes

D
homozygous genes

Solution

Alternative forms of the gene are called alleles. Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent.
Question 11
1 / -0

In peas, tall plant trait is dominant over dwarf. If a heterozygous for tall is crossed with one homozygous for dwarf, what will be the appearance of the offspring of a cross of F₁?

A
All tall

B
All dwarf

C
50% tall and 50% dwarf

D
75% tall and 25% dwarf

Solution

In peas, tall plant trait is dominant over dwarf. If a heterozygous for tall is crossed with one homozygous for dwarf, there will be 50% tall and 50% dwarf appearance of the offspring of a cross of F1.
Question 12
1 / -0

How many chromosomes are found in the cells of a human body?

A
23

B
48

C
24

D
46

Solution

Human beings have 23 pairs or 46 chromosomes. 22 of these pairs, called autosomes, look the same in both males and females. The 23^rdpair, the sex chromosomes, differ between males and females. Females have two copies of the X chromosome, while males have one X chromosome and one Y chromosome.
Question 13
1 / -0

Gene is a segment of

A
chromosome

B
DNA

C
RNA

D
both DNA and RNA

Solution

Gene is a segment of DNA. Genes, which are made up of DNA, act as instructions to make molecules called proteins. In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases.
Question 14
1 / -0

If father and mother possess blood group A, their children can have blood group

A
A

B
AB

C
A or B

D
A or O

Solution

If father and mother possess blood group A, their children can have blood group A or O.
Question 15
1 / -0

Identical twins arise when

A
sperm divides into two halves

B
two sperms fuses with one ovum

C
egg divides into two halves

D
one sperm fuses with two ova

Solution

Identical twins arise when egg divides into two halves which then divides into two separate embryos.
Question 16
1 / -0

In human beings, an example of a sex linked trait is

A
curly hair

B
sickle cell anemia

C
colour blindness

D
Down's syndrome

Solution

In human beings, an example of a sex linked trait is colour blindness. Color blindness, or color vision deficiency, is the decreased ability or inability to see color, or perceive color differences, under normal lighting conditions.
Question 17
1 / -0

Which of the following constitutes a gene in organisms except the virus?

A
Chromosome

B
Deoxyribonucleic acid

C
Nucleotide

D
Protein

Solution

Deoxyribonucleic acid constitutes a gene in organisms except the virus.
Question 18
1 / -0

Carriers of genetic information are

A
chromosomes

B
lysosomes

C
ribosomes

D
None of these

Solution

Carriers of genetic information are chromosomes. Each chromosome is made of protein and a single molecule of deoxyribonucleic acid (DNA).
Question 19
1 / -0

The manner of arrangement of genes in a chromosome is

A
scattered

B
irregular

C
spiral

D
linear

Solution

The manner of arrangement of genes in a chromosome is linear.
Question 20
1 / -0

Deoxyribonucleic acid (DNA) consists of simple sugar phosphate and four nitrogen bases. Which of the following groups of nitrogen bases is present in a DNA molecule?

A
Adenine, guanine, thymine, uracil

B
Cytosine, guanine, thymine, uracil

C
Adenine, thymine, guanine, cytosine

D
Adenine, cytosine, thymine, uracil

Solution

Adenine, thymine, guanine, cytosine are groups of nitrogen bases present in a DNA molecule.

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Heredity Test - 3

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Heredity Test - 3

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SHARING IS CARING

Question 1

heredity

variations

heredity and variations

inheritance and variations

Solution

Question 2

T.H. Morgan

G.J. Mendel

Hugo de Vries

Karl Correns

Solution

Question 3

test cross

reciprocal cross

monohybrid cross

back cross

Solution

Question 4

hieracium (Hawk weed)

bean (Phaseolus)

Both (1) and (2)

None of these

Solution

Question 5

easy to procure

easy to handle

easy to culture in laboratory

easily multiplied

Solution

Question 6

monohybrid cross

dihybrid cross

incomplete dominance

back cross

Solution

Question 7

1 : 1 : 1 : 1

1 : 2 : 1 : 0

0 : 3 : 1 : 0

1 : 1 : 1 : 0

Solution

Question 8

25%

50%

100%

10%

Solution

Question 9

AaBb x AaBb

aabb x AABb

Aabb x Aabb

AaBb x aabb

Solution

Question 10

factors

alleles

dominant genes

homozygous genes

Solution

Question 11

All tall

All dwarf

50% tall and 50% dwarf

75% tall and 25% dwarf

Solution

Question 12

23

48

24

46

Solution