Principles of Inheritance & Variation Questions

Assertion: During Morgan experiments, some genes were very tightly linked and showed very low recombination. Reason: In Fruiting, Eggs fertilised by sperm having an X-chromosome become females.

Match List I with List II:

Find out correct statement:

Read the following statements: (A) Mendel studied four characters related to colour in garden pea plant. (B) One pair of gene always segregates independently of another pair of gene. (C) Besides the involvement of multiple genes, polygenic inheritanc

Incomplete dominance can be seen in:

The character taken by Mendel were all except:

Given below are two statements : Statement I : Morgan and his group found that genes of eye colour and yellow body colour in Drosophila were very tightly linked and showed only 1.3 per cent recombination in F₁ generation. Statement II : Morgan carrie

Which of the following statements is not correct.

Match the column I with column II

With the help of given pedigree find out the probability for the birth of a child having no disease in F3 generation.

Largest chromosome in human is

Identify the incorrect statement about Down's syndrome.

Given below are two statements: Statement I: The pattern of inheritance of phenylketonuria cannot be studied by pedigree analysis. Statement II: ABO blood group system in humans is a case of polygenic inheritance. In the light of the above statements

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): A test cross of F1 progeny of snapdragon (being studied for inheritance of flower colour) gives a 1:1 ratio of red flowered and w

A man has blood group AB and his wife has blood group A. blood test of their children found to be blood group A, AB and B. Which of the blood group of children confirms that their mother is heterozygous for her blood group?

A heterozygous pea plant with violet flowers was crossed with a homozygous pea plant with white flowers. Violet is dominant over white. Which one of the following combinations represents the expected combinations among 40 progenies formed ?

Consider the cross CcDdEe × ccddEe. What will be the probability of following respectively ? (A) Heterozygous individuals for all characters (B) Homozygous recessive individuals (C) Individuals homozygous for first character and heterozygous for seco

In human beings, where genotype AABBCC represents dark skin colour, aabbcc represents light skin colour and AaBbCc represents intermediate skin colour; the pattern of genetic inheritance can be termed as-

Given pedigree represents inheritance of myotonic dystrophy which is an autosomal dominant disorder. What will be genotype of parents?

Which of the following is responsible for mental abnormalities in humans?

The chromosomal condition in Turner's syndrome is:

Ovum producing Klinefelter's syndrome shall have chromosome number:

Which one is not a feature of Down's syndrome?

Haploid chromosome number is 12. What is the number in a Monosomic?

Marriage between close relatives (consanguineous mating) should be avoided because it induces more:

α Thalassemia is due to the mutation of:

Which is NOT true about Phenylketonuria?

Thalassemia is a ______-linked ______ blood disease.

A person with sickle cell anemia is:

Queen Victoria was a carrier of:

The failure of cytokinesis after telophase stage of cell division results in an increase in a whole set of chromosomes in an organism and this phenomenon is known as:

Turner's syndrome is caused due to:

Klinefelter's syndrome is caused by the chromosomal condition:

The cause of Down's syndrome is the presence of an additional copy of chromosome number:

Which of the following is an example of Aneuploidy?

Phenylketonuria (PKU) is an:

In Sickle cell anemia, glutamic acid is replaced by ______ at the sixth position of the beta globin chain.

Haemophilia is a:

Which of the following is a Mendelian disorder?

In a pedigree chart, a circle represents:

Pedigree analysis is used to:

A change in a single base pair of DNA is called:

In honey bees, males produce sperm by:

Sex-determination in honey bees is based on the number of sets of chromosomes, which is called:

In birds, sex determination is of the type:

In which organism is the male heterogametic (XY)?

Who used the frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes?

The term 'recombination' describes:

The physical association of two genes on a chromosome is called:

Drosophila melanogaster was found suitable for genetic studies because: