Principles of Inheritance and Variation

When two unrelated individuals or lines are
crossed, the per romance of F1 hybrid is often
superior to both parents. This phenomenon is
called :

Mutations can be induced with :

Test cross in plants or in Drosophila involves
crossing :

Which one of the following conditions of the
zygotic cell would lead to the birth of a normal
human female child ?

Which one of the following cannot be explained
on the basis of Mendel's Law of Dominance?

ABO blood groups in humans are controlled by
the gene I. It has three alleles – IA, IB
and i.
Since there are three different alleles, six
different genotypes are possible. How many
phenotypes can occur –

Select the correct statement from the ones given
below with respect to dihybrid cross –

Which one of the following symbols and its
representation, used in human pedigree
analysis is correct –

The genotype of a plant showing the dominant
phenotype can be determined
by –

A cross in which an organism showing a
dominant phenotype in crossed with the
recessive parent in order to know its genotype is
called -

Study the pedigree chart of a certain family
given below and select the correct conculusion
which can be drawn for the character –

ABO blood grouping is controlled by gene I
which has three alleles and show co-dominance.
There are six genotypes. How many phenotypes
in all are possible -

In antirrhinum two plants with pink flowers were
hybridized. The F1 plants produced red, pink and
white flowers in the proportion of 1 red, 2 pink
and 1 white. What could be the genotype of the
two plants used for hybridization ? Red flower...

Sickle-cell anemia is :

The most popularly known blood grouping is
the ABO grouping. It is named ABO and not
ABC, because "O" in it refers to having :

Select the incorrect statement from the
following :

The genetic defect-adenosine deaminase (ADA)
deficiency may be cured permanently by

Study the pedigree chart given below :

What does it show ?

Haploids are more suitable for mutation studies
than the diploids. This is because:

Which one of the following conditions in
humans is correctly matched with its
chromosomal abnormality/linkage?

A common test to find the genotype of a hybrid
is by:-

In the hexaploid wheat, the haploid(n) and
basic(x) numbers of chromosomes are :

In pea plants, yellow seeds are dominant to
green. If a heterozygous yellow seeded plant is
crossed with a green seeded plant, what ratio of
yellow and green seeded plants would you
expect in F1 generation ?

Inheritance of skin colour in humans is an
example of:-

A human male produces sperms with the
genotypes AB, Ab, AB, and ab pertaining to two
diallelic characters in equal proportions. What is
the corresponding genotype of this person ?

Test cross involves-

How many different kinds of gametes will be
produced by a plant having the genotype
AABbCC ?

In Mendel's experiments with garden pea, round
seed shape (RR) was dominant over wrinkled
seeds (rr), yellow cotyledon (YY) was dominant
over green cotyledon (yy). What are the
expected phenotypes in the F2 generation of the
cross RRYY × rr...

Sickle cell anaemia has not been eliminated from
the African population because-

Cri-du-chat syndrome in humans is caused by
the-

Both sickle cell anemia and Huntington's chorea
are-

If a colour blind woman marries a normal visioned
man, their sons will be

Which one of the following is an example of
polygenic inheritance ?

Phenotype of an organism is the result of-

G-6-P dehydrogenase deficiency is associated
with haemolysis of -

A women with 47 chromosomes due to three
copies of chromosome 21 is characterized by

A man and a woman, who do not show any
apparent signs of a certain inherited disease,
have seven children (2 daughter and 5 sons).
Three of the sons suffer from the given disease
but none of the daughters are affected. Which of
the followin...

In order to find out the different types of
gametes produced by a pea plants having the
genotype AaBb, it should be crossed to a plant
with the genotype -

Haemophilia is more commonly seen in human
males than in human females because -

A woman with normal vision, but whose father
was colour bind, marries a colour blind man.
Suppose that the fourth child of this couple was
a boy. This boy -

Which of the following is not a hereditary
disease ?

A women with 47 chromosomes due to three
copies of chromosome 21 is characterized by -

One of the parents of a cross has a mutation in
its mitochondria. In that cross, that parent is
taken as a male. During segregation of F2
progenies that mutation is found in -

A male human is heterozygous for autosomal
genes A and B and is also hemizygous for
hemophilic gene h. What proportion of his
sperms will be abh :-

In a plant, red fruit (R) is dominant over yellow
fruit (r) and tallness (T) is dominant over
shortness (t). If a plant with RRTt genotype is
crossed with a plant that is rrtt

The recessive genes located on X-chromosomes
in humans are always-

Lack of independent assortment of two genes A
and B in fruit fly Drosophila is due to :-

A normal woman, whose father was colour-blind
is married to a normal man. The sons would be :-

Which one of the following conditions though
harmful in itself, is also a potential saviour from
a mosquito borne infectious disease ?

Two crosses between the same pair of genotypes
or phenotypes in which the sources of the
gametes are reversed in one cross, is known as : -