1. 1989 Q6 P1
The diagram below represents a mammalian bone
(a) State the functions labelled K and L
(b) State the region of the body in which the bone is found 2. 1991 Q1 P1
State two ways in which skeletal muscle fibers are adapted to their functions 3. 1991 Q5 P1
The diagram below shows the arrangement of bones and muscles in a human arm
A person accidentally touches a hot pan and responds as illustrated in the diagram below.
(a) Explain how the response illustrated above occurs. (b) Explain how auxins are utilised as selective weed killers in agriculture.
(a) The stimulus /heat/pain is detected by temperature/pain receptor( Thermo receptors) in the skin/dermis; An impulse is generated; impulse is transmitted along a sensory neurone to the CNS/spinal cord; (chemical) transmission across synapse to relay neurone; Across a synapse to motor neurone; across a synapse to biceps muscles,/effector via motor neurone; muscles/effectors contracts; (hand moves away). This is known as (simple reflex action);
In cats, the gene for fur colour is sex-linked. Letter G represents the gene for ginger fur colour while letter B represents the gene for black fur colour in a given cat species. These genes are co-dominant. Heterozygous females have ginger and black patches of fur and their phenotype is described as tortoise-shell.
(a) With reference to the information given above, what is meant by the term co-dominance? (b) Explain why male cats with a tortoise-shell phenotype do not usually occur. (c) A tortoise-shell female was crossed with a black male. Determine the genotypes and phenotypes of the offspring.
Explain the evolutionary basis for the ever changing drugs for malaria treatment.
malaria causing parasite over time become resistant to some malaria drugs; due to (gradually changing their genetic constitutions) mutation; which with time result in the evolution and eventual, perpetuation of the new strains of parasite hence necessitating the discovery of a more effective drug to counter the new/ emerging strains;
Explain the possible reason for the difference in the length of their fur.
Geographical distribution; made the animals adapt to survive in their environments(cold/hot), with those having thick fur being adapted to cold regions (for insulation); acc. Converse animal with short fur to adopt to hot area.
Genetic/being passed from parents to offspring's/genetic inheritance / genes being passed from parents to offspring;
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