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If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

A) 100% B) 50% C) 25% D) Nil Answer: C) 25% Explanation: Thalassemia is an autosomal recessive disease. The carrier of the disease is... View Article

A human female with Turner’s syndrome

A) has one additional X chromosome B) has 45 chromosomes with XO C) is able to produce children with normal husband D) exhibits male... View Article

Fruit colour in squash is an example of

A) dominant epistasis B) recessive epistasis C) inhibitory genes D) complementary genes Answer:A) dominant epistasis Explanation:... View Article

An abnormal human baby with ‘XXX’ sex chromosomes was born due to

A) fusion of two sperms and one ovum B) fusion of two ova and one sperm C) formation of abnormal ova in the mother D) formation of abnormal... View Article

How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?

A) 7 B) 8 C) 5 D) 6 Answer: A) 7 Explanation: Mendel conducted hybridisation experiments on pea plants from 1856-1863. Mendel proposed laws... View Article

A man with blood group ‘A’ marries a woman with blood group ‘B’. What are all the possible blood groups of their offsprings?

A) O only B) A, B, AB and O C) A and B only D) O only Answer:B) A, B, AB and O Explanation: The genotype of blood group A can be IAIA or... View Article

Multiple alleles are present

A) on nonsister chromatids B) at the same locus of the chromosome C) at different loci on the same chromosome D) on different chromosomes... View Article

Alleles are

A) heterozygotes B) different forms of a gene C) true breeding homozygotes D) different phenotype Answer: B) different forms of a gene... View Article

The term “linkage” was coined by

A) Sutton B) Mendel C) Boveri D) H.Morgan Answer: D) T.H.Morgan Explanation: T.H. Morgan coined the term linkage to explain the inheritance... View Article

A pleiotropic gene

A) controls multiple traits in an individual B) controls a trait only in combination with another gene C) is a gene evolved during Pliocene D)... View Article

Which of the following most appropriately describes haemophilia?

A) Dominant gene disorder B) Chromosomal disorder C) X-linked recessive gene disorder D) Recessive gene disorder Answer:C)... View Article

Pick out the incorrect statement for diseases given

A) Down’s syndrome is due to aneuploidy B) Haemophilia is a sexlinked recessive disease C) Sickle cell anaemia is an X-linked recessive gene... View Article

A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in

A) polyteny B) somaclonal variation C) polyploidy D) aneuploidy Answer:C) polyploidy Explanation: Polyploidy refers to the condition,... View Article

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Archives

If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

A human female with Turner’s syndrome

Fruit colour in squash is an example of

An abnormal human baby with ‘XXX’ sex chromosomes was born due to

How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?

A man with blood group ‘A’ marries a woman with blood group ‘B’. What are all the possible blood groups of their offsprings?

Multiple alleles are present

Alleles are

The term “linkage” was coined by

A pleiotropic gene

Which of the following most appropriately describes haemophilia?

Pick out the incorrect statement for diseases given

Among the following characters, which one was not considered by Mendel in his experiments on pea?

What Does The Survival Factor Do?

What Are Survival Factors?

How Would You Justify That Growth And Division Are Coordinated By Multiple Mechanisms In Animal Cells?

Is Yeast Cell Size Constant?

How Is It Evident That Robust Mechanisms Are Present In Yeasts Which Coordinate For Cell Division And Growth?

How Is Protein Synthesis A Major Determinant Of Cell Growth?

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