AIPMT-PRELIMS Botany Principles of Inheritance and Variation Class 12 Questions

A normal-visioned man whose father was colour-blind, 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?

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

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

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

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

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

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?

Study the pedigree chart given below: What does it show?

Select the incorrect statement from the following:

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

Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RrYy and rryy genotypes are hybridized, the F₂ segregation will show

Inheritance of skin colour in humans is an example of

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?

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

Phenotype of an organism is the result of:

In which mode of inheritance do you expect more maternal influence among the offspring?

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

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

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 RRY Y × rry y?

Test cross involves :

If a colourblind woman marries a normal visioned man, their sons will be :

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

Both sickle cell anaemia and Huntington's chorea are:

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?

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

Which of the following is not a hereditary disease?

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

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

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

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

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

Crossing over that results in genetic recombination in higher organisms occurs between :-

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 :-

A self-fertilizing trihybrid plant forms :-

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

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 rtt

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 -

Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder :-

The linkage map of X⁻chromosome of fruitfly has 66 units, with yellow body gene (y) at one end and bobbed hair (b) gene at the other end. The recombination frequency between these two genes (y and b) should be :-

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 :-

The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes :-

Which one of the following traits of garden pea studied by Mendel was a recessive feature :-

Pattern baldness, moustaches and beard in human males are examples of :-

When a cluster of genes show linkage behaviour they :-

Christmas disease is another name for :-

In Drosophila, the sex is determined by :-

Which of the following is correct match -