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.