Indentify the incorrect statement:

1. Tall plant produce gametes by meiosis and the dwarf plants by mitosis.

2. Only one allele is transmitted to a gamete.

3. The segregation of alleles is a random process.

4. Gametes will always be pure for the trait.

Subtopic:  Monohybrid Cross: 1 |
 76%
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The ultimate source of allelic variation is:

(1) Recombination

(2) Natural selection

(3) Mutation

(4) Drift

Subtopic:  Linkage |
From NCERT
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In the case of co-dominance, the F1 generation resembles:

(1) Dominant parent

(2) Recessive parent

(3) Both the parents

(4) None of the parents

Subtopic:  Dominance Deviation from Mendel: 1 |
 76%
From NCERT
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What can be the possible blood groups of progeny whose father and mother are of A and B group respectively?

(1) A and B only

(2) AB only

(3) All except O

(4) A, B, AB and O

Subtopic:  Dominance Deviation from Mendel: 2 |
 72%
From NCERT
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When Morgan hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F1 progeny, the F2 ratio deviated very significantly from the 9:3:3:1 ratio. this can be attributed to the fact that:

(1) The genes are located on X and Y chromosomes

(2) Fruit fly has abnormal chromosomes

(3) The genes are located on the X chromosome

(4) The genes exhibit incomplete dominance

Subtopic:  Chromosomal Basis of Inheritance: Further Considerations |
 58%
From NCERT
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What is incorrect for Hemophilia?

1. In this disease, a single protein that is a part of the cascade of proteins involved in the clotting of blood is affected.

2. In an affected indlvidual a simple cut will result in non-stop bleeding.

3. The heterozygous female (carrier) for haemophilia may transmit the disease to sons.

4. The possibility of a female becoming a haemophilic is extremely rare because mother of such a female has to be hemophilic and the father should be a carrier.

Subtopic:  Mendelian Disorders: Hemophilia |
 70%
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Sickle cell anaemia results from.

1. A chromosomal aberration

2. Non disjunction of autosome

3. A point mutation

4. Blood transfusion reaction

Subtopic:  Mendelian Disorders: Sickle Cell Anemia |
 79%
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What is the mode of inheritance of phenylketonuria?

1. Autosomal recessive

2. Autosomal dominant

3. Sex linked recessive

4. Sex linked dominant

Subtopic:  Mendelian Disorders |
 79%
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Failure of cytokinesis after telophase stage of cell divislon results in an increase in a whole set of chromosomes in an organism and, this phenomenon is known as:

1. Aneuploidy

2. Translocation

3. Polyploidy.

4. Inversion

Subtopic:  Non - Disjunction & Aneuploidy |
 75%
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Which of the following is not a feature of Down's Syndrome?

1. It is caused by a non-disjunction in an autosome

2. The affected individual has trisomy of chromosome 21

3. The aflected individual has a characteristic simian palmar crease

4. The mental development of affected individual is normal

Subtopic:  Non - Disjunction & Aneuploidy |
 71%
From NCERT
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