Genetics Questions

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

The unequivocal proof of $\text{DNA}$ as the genetic material came from the studies on a:

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

Point mutation involves:

The most popularly known blood grouping is the $\text{ABO}$ grouping. It is named $\text{ABO}$ and not $\text{ABC}$, because "O" refers to having:

In a dihybrid cross ($AaBb\times AaBb$), the phenotypic ratio of the offspring is:

Which condition is correctly matched with its chromosomal abnormality?

Haploids are more suitable for mutation studies than diploids because:

How does molecular taxonomy help in classification?

Which of the following provides the most reliable classification of organisms?

What would be the number of chromosomes in the cells of the aleurone layer in a plant species with 8 chromosomes in its synergids ?

Comparative biochemistry provides a strong evidence in favour of common ancestry of living beings.

Assertion : In humans, the gamete contributed by the male determines whether the child produced will be male or female.Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on X-chromosome and some on Y-chromosome.

Assertion : Senescence is the time when age associated defects are manifested.Reason : Certain genes may be undergoing sequential switching on and off during one's life.

Primary source of allelic variation is:

Grain colour in wheat is determined by three pairs of polygenes. Following the cross AABBCC (dark colour) x aabbcc (light colour), in $F_2$ generation what proportion of the progeny is likely to resemble either parent?

The "cri-du-chat" syndrome is caused by change in chromosome structure involving:

Given below is a pedigree chart showing the inheritance of a certain sex-linked trait in humans.

The trait traced in the above pedigree chart is:

Which one of the following statements is true for protein synthesis (translation)?

Genes for cytoplasmic male sterility in plants are generally located in :

Satellite DNA is important because it:

Genetic drift operates in:

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

A true breeding plant is:

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

Match Column-I with Column-II:Column-I: (a) Pistils fused together, (b) Formation of gametes, (c) Hyphae of higher Ascomycetes, (d) Unisexual female flowerColumn-II: (i) Gametogenesis, (ii) Pistillate, (iii) Syncarpous, (iv) Dikaryotic

Which one of the following generates new genetic combinations leading to variation?

Pick out the correct statements:(i) Haemophilia is a sex – linked recessive disease(ii) Down’s syndrome is due to aneuploidy(iii) Phenylketonuria is an autosomal recessive gene disorder(iv) Sickle cell anaemia is an autosomal recessive gene disorder

A complex of ribosomes attached to single strand of RNA is known as:

Which of the following is required as inducer(s) for the expression of Lac operon?

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the $F_1$ plants were selfed the resulting genotypes were in the ratio of:

A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughters and 5 sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following mode of inheritance do you suggest for this disease ?

Which of the following most appropriately describes haemophilia?

Match the terms in column I with their description in Column II:
Column I: (a) Dominance, (b) Codominance, (c) Pleiotropy, (d) Polygenic inheritance
Column II: (i) Many genes govern a single character, (ii) In a heterozygous organism only one allele expresses itself, (iii) In a heterozygous organism both alleles express themselves fully, (iv) A single gene influences many characters

In a testcross involving $F_1$ dihybrid flies, more parental – type offspring were produced than the recombinant – type offspring. This indicates:

In Hardy-Weinberg equation, the frequency of heterozygous individual is represented by:

Balbiani rings are sites of:

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

Which one of the following is not applicable to RNA?

Identify the correct order of organisation of genetic material from largest to smallest:

A gene showing codominance has:

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

A pleiotropic gene:

The term ‘’linkage’’ was coined by:

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?

A human female with Turner's syndrome:

In a population of $1000$ individuals, $360$ belong to genotype $AA$, $480$ to $Aa$ and the remaining $160$ to $aa$. Based on this data, the frequency of allele $A$ in the population is:

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

Fruit colour in squash is an example of:

Transformation was discovered by: