Principles of Inheritance and Variation

What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia,
and is sterile?

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance
between genes was explained by :

Select the incorrect statement.

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation, pink
flowers were obtained. When pink flowers were selfed, the F2 generation showed white, red and pink
flowers. Choose the incorrect statement ...

What map unit (Centimorgan) is adopted in the construction of genetic maps?

A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the
frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?

A woman has an X-linked condition on one of
her X chromosomes. This chromosome can be
inherited by

Which of the following pairs is wrongly matched?

Which of the following characteristics represent 'Inheritance of blood groups' in humans?
a. Dominance
b. Co-dominance
c. Multiple allele
d. Incomplete dominance
e. Polygenic inheritance

A disease caused by an autosomal primary non-disjunction is :

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

The genotypes of a Husband and Wife are IAIB and IAi.
Among the blood types of their children, how many different genotypes and phenotypes are possible?

Among the following characters, which one was
not considered by Mendel in his experiments on
pea?

Which one from those given below is the period for Mendel’s hybridisation experiments ?

If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their
son being colour-blind is

The mechanism that causes a gene to move from one linkage group to another is called

A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell
is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is contaning more
nu...

Pick out the correct statements :
(a) Haemophilia is a sex-linked recessive disease.
(b) Down's syndrome is due to aneuploidy.
(c) Phenylketonuria is an autosomal recessive gene disorder.
(d) Sickle cell anaemia is an X – linked recessive g...

Match the terms in Column-I with their description in Column-II and choose the correct option :

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In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-typeoffspring. This indicates

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants
were selfed the resulting genotypes were in the ratio of -

Which of the following most appropriately describes haemophilia ?

A pleiotropic gene -

A colour blind man marries a woman with
normal sight who has no history of colour
blindness in her family. What is the
probability of their grandson being colour
blind?

In his classic experiments on pea plants,
Mendel did not use :

The term "linkage" was coined by -

A gene showing codominance has :

In the following human pedigree, the filled
symbols represent the affected individuals.
Identify the type of given pedigree.

The movement of a gene from one linkage group
to another is called

An abnormal human baby with ‘XXX’ sex
chromosomes was born due to

How many pairs of contrasting characters in pea
plants were studied by Mendel in his
experiments?

A man with blood group ‘A’ marries a woman
with blood group ‘B’. What are all the possible
blood groups of their offsprings?

Alleles are

Multiple alleles are present

Fruit colour in squash is an example of :

A human female with Turner’s syndrome :

A man whose father was colour blind marries a women who had a colour blind mother and
normal father. What percentage of male children of this couple will be colour blind?

Down's syndrome in humans is due to :

Which one is the incorrect statement with regards
to the importance of pedigree analysis?

Which of the following cannot be detected in a developing foetus by amniocentesis ?

Select the incorrect statement with regard to Haemophilia is :

If two persons with 'AB' blood group marry and have sufficiently large number of children, these children
could be classified as 'A' blood group : 'AB' blood group : 'B' blood group in 1 : 2 : 1 ratio. Modern technique
of protein electropho...

Which idea is depicted by a cross in which the F1
generation resembles both the parents?

If both parents are carriers for thalessemia, which is an autosomal recessive disorder, what are the chances of
pregnancy resulting in an affected child ?

F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2
: 1. It represents a case of

A normal - visioned man whose father was colour bilind, marries a woman whose father was also
colour - blind. They have their first child as a daughter. What are the chances that this child would be
colour blind

A test cross is carried out to :

Represented below is the inheritance pattern of the certain type of traits in humans. Which one of the
following conditions could be an example of this pattern ?

Which one of the following is a wrong statement regarding mutations ?

Which one of the following conditions correctly
describes the manner of determining the sex ?