Waec Biology 2004 Past Questions and Answers

Question 51:

• WAEC 2004

Which of these physiological variations is sex-linked?

A. Albinism
B. Blood groups
C. Sickle-cell anaemia
D. Haemophilic condition

Question 52:

• WAEC 2004

The ability of some individuals to taste phenylthiocarbamide (PTC) is a

A. Morphological adaptation
B. Morphological variation
C. Physiological adaptation
D. Physiological variation

Question 53:

• WAEC 2004

In man, sex is determined by the inheritance of

A. A pair of homologous chromosomes
B. An extra chromosome in the cells of a female
C. A dominant gene for maleness present in man
D. Two similar X chromosomes in the female and X and Y chromosomes in the male.

Question 54:

• WAEC 2004

What will be the genotypic ratio when two heterozygous red pea plants are crossed?

A. 1 : 0
B. 1 : 2 : 1
C. 2 : 1
D. 3 : 1

Question 55:

• WAEC 2004

Which of the following traits in humans can be affected by environmental factors?

A. Skin colour
B. Eye colour
C. Baldness
D. Tongue-rolling