Formative Practice 11.3 (Form 5 Biology Textbook Exercise and Answer)

Question 1:
State the meaning of:
(a) locus
(b) allele

(a) Locus: Specific location of a gene in a chromosome.

(b) Allele: An alternative form of a gene for a specific trait that is located on the same locus of a pair of homologous chromosome.

Question 2:
Based on the figure below, explain the relationship between locus, gene and allele.

Based on the figure, gene that controls flower colour of pea plant is at the same locus of a homologous chromosome and appear as two alleles, which are P and p. P allele determines purple flower (dominant allele) and p allele determines white flower (recessive allele).

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