Meiosis is characterized by

Which of the following does not result in variations among siblings?

Identify the wrong statement about meiosis

A diploid cell with a diploid number of 24 chromosomes undergoes meiosis. How many chromosomes are present in each daughter cell after division?

What type of cell division occurs in cells of testes and ovaries? 

Meiosis results in _____.

Meiosis I is reductional division, and meiosis II is equational division because of 

Meiotic division takes place in

Meiosis is of evolutionary significance as it produces

What is the importance of crossover?

Which of the following structures are formed by two homologous chromosomes pair during crossing over?

In prophase I of meiosis I __________ occurs.

What structures exchange genetic material during crossing over?

Hemophilia disease is produced in the male by how many gene/s?

• Genetic disorders can be chromosomal, multifactorial and monogenic
• Hemophilia is a blood disorder that delays blood clotting or hemostasis
• Blood clotting is a result of cascade of reactions done by clotting factors (1 to 12)
• Absence of clotting factor VIII or IX causes hemophilia
• Gene (F8 or F9) responsible for hemophilia is present in X chromosome

How do genetic disorders happen?

• Genetic disorder is due to alteration in gene sequence
• The gene sequence change can occur in a cell irrespective of type of cell division a cell undergoes
• Mutation can occur at any point of cell division
• Trisomy can be attributed as a result of meiosis

In Down’s syndrome of a male child, the sex chromosome is

• Down syndrome is a genetic disorder 
• It is a trisomy condition having extra copy of chromosome 21
• The individual affected will have disability associated with nervous system
• Sex chromosome remains unaffected irrespective of the disorder