Which of the following is true of the children of a heamophilic man who marries a woman that is not haemophilic and does not carry the trait?

• A. All their sons will be haemophlic
• B. all their daughters will be haemophilic
• C. All their daughters will be carriers
• D. all their sons will be carriers

A child with blood group genotype different from those of both parents and with a mother of genotype OO, can only have a father of genotype

• A. A
• B. B
• C. AB
• D. OO

Woman do not suffer from colour blindness because

• A. the trait is sex-linked
• B. only men are colour blind
• C. the genes are recessive and sex-linked
• D. the genes occur on both the X and Y chromosomes

Which of the following insects undergoes incomplete metamorphosis?

• A. Mosquito
• B. Termite
• C. Housefly
• D. Moth

If R and r, denotes the genes for a character, the offspring of the cross between RR and Rr are

• A. RR, 2Rr, rr
• B. 2RR, 2rr, 2rr
• C. 2RR, 2Rr
• D. 4Rr

A tissue can best be defined as

• A. an aggregate of similar cells
• B. an aggregate of cells performing a similar function
• C. an aggregate of similar cells performing the same function
• D. a mixture of different cells types performing the same function

A mammal with red fur and long ears was crossed with another having white fur and short ears. If the offspring had a red fur and short ears, the

• A. character are linked
• B. character are not linked
• C. parents are related
• D. parents are not related

Which of the following is true of climax community?

• A. it persists until the enviroment or climate changes
• B. it changes drastically from one year to the next
• C. it is first stage in succession
• D. It is made up of the tallest trees and the smallest

The blood vessel which carries blood from the alimentary canal to the liver is the

• A. hepatic artery
• B. hepatic vein
• C. hepatic portal vein
• D. mesenteric artery

Malaria symptoms are caused by

• A. toxins released into the blood as a result of the destruction of red blood cell
• B. the multiplication of the malaria sporozites in the liver
• C. the invasion of the red blood cells by the trophozoites
• D. the development of merozoites into gametocytes