How many pairs of chromosomes are present in human beings? Out of these, how many are sex chromosomes? How many types of sex chromosomes are found in human beings? The sex of a newborn child is a matter of chance and none of the parents may be considered responsible for it Draw a flowchart showing the determination of sex of a newborn to justify this statement.

Which of the following is a carrier of heredity?

• A. Gene
• B. DNA
• C. Chromosome
• D. All of the above

Which of the following is a cryoprotectant?

• (A) Mannitol
• (B) DMSO
• (C) Ethylene oxide
• (D) All of the above

Which of the following is a pair of analogous organs?

• A) Wing of the bird and flipper of whale
• B) Fore limbs of horse and man
• C) Wing of bird and forelimb of horse
• D) Wing of insect and wing of bird

Which of the following is an exotic breed of sheep?

• A. Nali
• B. Lohi
• C. Merino
• D. Bakharwal

Which of the following is the father of evolutionary concepts?

• A. George cuvier
• B. Buffon
• C. Charles Darwin
• D. Lamarck