I. Choose the best 4 x 1 = 4 1. Pea plants form a symbiotic association with a/an

a. fungus b. alga c. bacterium d. virus

2. Which of these obtain nutrition from dead and decaying matter?

a. parasitic plants b. saprophytic plants c. insectivorus plants d. symbiotic plants

3. Plants obtain carbon dioxide from the atmosphere through these structures.

a. grana b. stroma c. stomata d. thylakoid

4. Which of these are/is required for photosynthesis?

a. chlorophyll b. sunlight and water c. carbon dioxide d. all of these

answercoenzymes;

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%.