K.C.S.E Biology Q & A - MODEL 2018PP2QN02
Below is a graphical representation of students’ height in a classroom.
(a) Name the type of curve illustrated.
(b) (i) State the type of variation represented by the curve.
(ii) State two meiotic processes that lead to variation among organisms.
(iii) Explain the role of variation in organisms.
(c) Explain the need for genetic counselling in present day health facilities.
a) Normal distribution curve;
b) i. Continuous (variation);
ii. Independent assortment;
iii. Organisms/individuals with advantageous traits/variations are favoured/selected by nature; and survive to reproduce/pass on/propagate the advantageous/favourable traits to their off-spring;
Variation ensures propagation of desirable/favourable traits; to the future generations/off-spring, ensuring improved/quality population;
c) Provides information/advice to individuals/families/communities about genetic disorders;
Helps identify/test/advice families/communities on possible risks of genetic disorders;
Provides supportive services/serves as patient advocates/refer individuals/families to relevant health professionals;