Match the following vocabulary words. 1. olfactory nerve The nerve that transmits sound impulses to the cerebral cortex 2. epidermis The snail-shaped structure which translates sound vibrations into nerve impulses 3. auditory nerve The inner layer of skin 4. tympanic membrane The outermost layer of skin 5. dermis The nerve that sends smell messages to the brain 6. auricle Catches and directs sound waves 7. cochlea A structure in the inner ear composed of three looped tubes 8. semicircular canal The ear drum

we solve the problem using the hardy-wineberg equation.

let us start with the homozygous recessive proportion of individuals with sickle cell anaemia,

we have the proportion as q² = 0.25.

∴ q = 0.5 (frequency of hbs in population)

further,

solving for the frequency of normal cell by using the fact that,

p + q = 1

∴ p = 1 - 0.5 = 1 - 0.5 = 0.5

now we can calculate 2pq in p² + 2pq + q², which is the frequency for heterozygous carriers of sickle cell anaemia,

∴ 2pq = 2 x 0.5 x 0.5 = 0.5

and the homozygous normal cell individuals proportion is given by the expression,

∴ p² = 0.5² = 0.25

hence, the carriers for sickle cell anaemia are in proportion, 0.5, or 50%.