Biology 2003 Waec Past Questions and Answers

Question 36 :

• WAEC 2003

The organic molecule (s) present in the nucleus is/are

A. DNA
B. Protein, RNA andDNA
C. RNA and ATP
D. RNA

Question 37 :

• WAEC 2003

In an experiment, a red-flowered plant was crossed with another red-flowered plant and the following results were obtained: 448 red flowers and 154 white flowers in the F₁ generation.
Which of the following represents the phenotypic ratio of the above genetic cross?

A. 1:2:1
B. 4:1
C. 3:1
D. 2:2

Question 38 :

• WAEC 2003

In an experiment, a red-flowered plant was crossed with another red-flowered plant and the following results were obtained: 448 red flowers and 154 white flowers in the F₁ generation.Which of the following represents the genotypes of the parents if R is for red gene and r for white gene?

A. RR X Rr
B. RR X rr
C. Rr x rr
D. Rr x Rr

Question 39 :

• WAEC 2003

In Mendel's experiments, it was discovered that the skin of an African can be attributed to

A. A blending of black and white genes
B. Recombination of genes
C. Loss of the epidermis
D. Mutation in the skin cells

Question 40 :

• WAEC 2003

Sickle-cell anaemia has persisted in the human race due to

A. Lack of proper medical care for sicklers
B. Carriers being more resistant to malaria
C. Mosquito vectors
D. Wildlife intermediate hosts