Which of the following is the most suitable medium for the culture of Drosophila melanogaster?

1. Cow dung 2. Moist bread
3. Agar agar 4. Ripe Banana
Subtopic:  Chromosomal Basis of Inheritance: Introduction | Linkage |
 65%
From NCERT

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.


Mental retardation in man occurs due to:
1. Loss of one X chromosome
2. Addition of one X chromosome
3. Slight growth in Y
4. Overgrowth in Y

Subtopic:  Non - Disjunction & Aneuploidy |
 73%
From NCERT
AIPMT - 1998

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.


Which of the following is a recessive trait in Pisum sativum?

1. Yellow pod color 2. Axial flower position
3. Inflated pod shape 4. Violet flower color
Subtopic:  Introduction to Genetics: 2 |
 67%
From NCERT

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.


In humans, the condition red-green color blindness is a sex-linked recessive trait. In a family pedigree analysis, you find that two people with normal color vision have a color-blind son. This is possible if the genotypes of the parents are:

1. XcXc and XcY 2. XcXc and XCY
3. XCXC and XcY 4. XCXc and XCY
Subtopic:  Pedigree Analysis: Basics |
 58%

To unlock all the explanations of this course, you need to be enrolled.

Hints

The improvement of microscopy techniques in the late 1800s set the stage for the emergence of modern genetics because:

1. it revealed new and unanticipated features of Mendel’s pea plant varieties.
2. it allowed biologists to study meiosis and mitosis, revealing the parallels between the behaviors of genes and chromosomes.
3. it allowed scientists to see the DNA present within chromosomes.
4. it led to the discovery of mitochondria.
Subtopic:  Introduction to Genetics: 1 | Introduction to Genetics: 2 |
 81%
From NCERT

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.


The salivary gland chromosomes in the dipteran larva, are useful in gene mapping because:

1. They have endoreduplication chromosomes
2. These are fused
3. These are easy to stain
4. These are much longer in size
Subtopic:  Recombination & Gene Mapping |
 50%
AIPMT - 2005

To unlock all the explanations of this course, you need to be enrolled.

Hints

Identify the correct statements regarding linked genes:

I. are located near each other on the same chromosome.
II. violate the law of independent assortment.
III. segregate together during meiosis.
 
1. I & II only 2. I & III only
3. II & III only 4. I, II & III
Subtopic:  Understanding Linkage |
 74%

To unlock all the explanations of this course, you need to be enrolled.

Hints

The pedigree shown below cannot be:

I. Autosomal dominant disorder
II. Autosomal recessive disorder
III. Sex-linked dominant disorder
IV. Sex-linked recessive disorder
V. Holandric disorder
 
1. I, II, and III only 2. I, II, III, and V only
3. I, III, IV, and V only 4. I, II, III, IV and V
Subtopic:  Pedigree Analysis: Basics |

To unlock all the explanations of this course, you need to be enrolled.

Hints

Assuming independent assortment, the ratio of progeny with the genotypes AaBb : Aabb : aaBb : aabb from a dihybrid cross AabB X AaBb will respectively be:

1. 4 : 3 : 2 : 1 2. 4 : 4 : 2 : 1
3. 4 : 2 : 2 : 1 4. 4 : 2 : 1 : 1
Subtopic:  Dihybrid Cross Analysis |
 81%
From NCERT

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.


A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was six feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X- linked recessive. What proportion of their sons would be color-blind and of normal height?

1. All 2. None
3. Half 4. One out of four

Subtopic:  Sex Linked Inheritance: Characteristics |
 51%

To unlock all the explanations of this course, you need to be enrolled.

Hints