Which of the following statements is the most appropriate for sickle cell anaemia?
1. It cannot be treated with iron supplements
2. It is a molecular disease
3. It confers resistance to acquiring malaria
4. All of the above

Subtopic:  Mendelian Disorders: Sickle Cell Anemia |
 64%
Please attempt this question first.
Hints

In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that:
1. The alleles of two genes are interacting with each other
2. It is a multigenic inheritance
3. It is a case of multiple allelism
4. The alleles of two genes are segregating independently.
Subtopic:  Dihybrid Cross Analysis |
 86%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.

Which of the following will not result in variations among siblings?
1. Independent assortment of genes
2. Crossing over
3. Linkage
4. Mutation
Subtopic:  Linkage |
 69%
Please attempt this question first.
Hints

Mendel’s Law of independent assortment holds good for genes situated on the:
1. non-homologous chromosomes
2. homologous chromosomes
3. extra nuclear genetic element
4. same chromosome
Subtopic:  Law of Segregation |
Please attempt this question first.
Hints

Occasionally, a single gene may express more than one effect. The phenomenon is called:
1. multiple allelism
2. mosaicism
3. pleiotropy
4. polygeny
Subtopic:  Polygenic Inheritance & Pleiotropy |
 87%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.

In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:
1. males and females, respectively
2. females and males, respectively
3. all males
4. all females
Subtopic:  Sex Determination |
 82%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.

The inheritance pattern of a gene over generations among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to:
1. quantitative trait
2. Mendelian trait
3. polygenic trait
4. maternal trait
Subtopic:  Pedigree Analysis: Basics |
 81%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.

It is said that Mendel proposed that the factor controlling any character is discrete and independent. His
proposition was based on the
1. results of F3 generation of a cross.
2. observations that the offspring of a cross made between the plants having two contrasting
characters shows only one character without any blending.
3. self pollination of F1 offsprings
4. cross pollination of F1 generation with recessive parent
Subtopic:  Law of Segregation |
 75%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.

Two genes ‘A’ and ‘B’ are linked. In a dihybrid cross involving these two genes, the F1 heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?
1. 1 : 1 : 1: 1
2. 9 : 3 : 3 : 1
3. 3 : 1
4. 1 : 1
Subtopic:  Understanding Linkage |
Please attempt this question first.
Hints

In the F2 generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are:
1. phenotypes - 4; genotypes - 16
2. phenotypes - 9; genotypes - 4
3. phenotypes - 4; genotypes - 8
4. phenotypes - 4; genotypes - 9
Subtopic:  Dihybrid Cross Analysis |
 56%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.