2023 WASSCE: Likely Biology Questions

On Friday, 1st September, 2023, the 2023 WASSCE Biology paper will be written. Here are some likely questions for all candidates

QUESTIONS

1.a Explain the following terms:

i. test cross;

ii. allele

iii. Albinism

iv. sex linkage

b. A man with normal vision married a woman who is a carrier of colour blindness. With the aid of genetic diagrams determine the likely status of their offspring.

c. Outline Lamarck’s theory of evolution.

2. a.i What is a gene?

ii. Differentiate between the terms genotype and phenotype.

b. Explain the following terms:

i. hybrid;

ii. pure breeding;

iii. Nucleotide.

c. In garden pea seeds, smooth seed coat is dominant over rough seed coat. With the aid of a genetic diagram, determine the result expected if a homozygous rough pea is crossed with a smooth seed coat plant whose parent were rough coated.

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3. (a) Explain the following terms:

(i) Test cross;
(ii) recessive allele;
(iii) homozygote.

(b) (i) Why is sickle-cell anaemia considered a deadly disease?

(ii) Explain briefly how sickle-cell anaemia can be reduced in a population

(iii) State one advantage which a carrier of the sickle-cell anaemia trait has.

4. (a) (i) What is competition?

(ii)In a tabular form, state four differences between competition and succession

(b) A pure strain goat with black coloured fur was crossed with a pure strain goat with white coloured fur, all the offspring had black coloured fur.

(i) With the aid of a genetic diagram, determine the phenotypic ratio of the F2 generation if the F1 offspring are selfed.

(ii) What would be the outcome of mating a black heterozygote offspring from the F2 generation with the original black coloured parent?

WASSCE 2023: Food and Nutrition Projected Questions

5. (a) Explain the following terms;

i. test cross

ii. monohybrid cross

(b) In a mango plant, the allele for bean-shaped seed is r and is recessive to round-shaped seed R. With the aid of a genetic diagram, determine the genotypes of the offspring if a homozygous bean shaped parent is crossed with a homozygous round shaped parent.