Principles of Inheritance and Variation PYQ — Page 5

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

$\mathrm{F}_2$ generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as $1: 2: 1$. It represents a case of

The idea of mutations was brought forth by

Represented below is the inheritance pattern of a 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?

Test cross in plants of in Drosophila involves crossing

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 $F_1$ hybrid is often superior to both its parents. This phenomenon is called

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

A person with unknown blood group under $A B O$ system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid certificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend?

What will you look for to identity the sex of the following?

Mutations can be induced with

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

In Antirrhinum, two plants with pink flowers were hybridized. The $\mathrm{F}_1$ 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 colour is determined by $\mathrm{RR}$, and white by $\mathrm{rr}$ genes.

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

$\quad$ ABO blood groups in humans are controlled by the gene I. It has three alleles $-\mathrm{I}^{\mathrm{A}}, \mathrm{I}^{\mathrm{B}}$ and $\mathrm{i}$. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

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

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

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

The fruit fly, Drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because

Select the incorrect statement from the following :

Point mutation involves