The equation = B represents, which of the following?
Natality
Growth rate
Mortality
All of these
Identify which one of the following is an example, of incomplete ecosystem?
Grassland
Cave
River
Wetland
Only one of the following four ways through which AIDS can spread?
Infected needles and syringes
Through mosquito bites
Looking after AIDS patient
Shaking hands, coughing, sneezing, hugging
Active immunity development is related to
natural killer cells
memory cells
helper T cells
suppressor T cells
Filariasis is caused by
dead adult filariae
microfilariae
biting of filarial worm
presence of bacteria in filarial wall
Indicate, the inheritance of which of the following is controlled by multiple alleles?
Colourblindness
Sickle cell anaemia
Blood group
Phenylketoneuria
Which of the following conditions is related to haemophilia?
A responsible recessive gene present in the X-chromosome
A responsible dominant gene presentin the X-chromosome
A responsible dominant gene present in the Y-chromosome
A responsible dominant gene present in the autosomal chromosome
A.
A responsible recessive gene present in the X-chromosome
Haemophilia is the most serious and notorious disease which is more common in man than in woman. The person which contains the recessive gene for haemophilia lacks normal clotting substance (thromboplastin) in blood so, amino injuries cause continuous bleeding and ultimate death. It is X-linked disease.
The absence of which clotting factor leads to haemophilia-A?
Factor VII
Factor VIII
Factor IX
Factor X