Haemophilia is more commonly seen in human males than in human females because
this disease is due to an X- linked dominant mutation
a greater proportion of girls die in infancy
this disease is due to an X- linked recessive mutation
this disease is due to a Y- linked recessive mutation
C.
this disease is due to an X- linked recessive mutation
Haemophilia is a hereditary (recessive X- linked) disease caused due to fault in genes, controlling the factors VIII and IX, on X chromosome.
Males have one X and Y chromosome each. Y chromosome does not carry any gene for blood clotting. Therefore, this condition is usually seen in males as they carry only one faulty X chromosome.
Females are generally the carrier of the disease as in females, two faulty X- chroromsomes are needed to cause the disease.
G-6-P dehydrogenase deficiency is associated with haemolysis of
lymphocytes
RBCs
platelets
leucocytes
Which of the following substances, if introduce in the blood stream, would cause coagulation, at the site of its introduction?
Fibrinogen
Prothrombin
Heparin
Thromboplastin
The first heart sound is produced when
diastole begins
semilunar valve close quickly
interventricular pressure decrease
bicuspid and tricuspid valve close quickly
The epithelial lining in the alveoli of the frogs facing lung cavity is
squamous ciliated
columnar ciliated
columnar nonciliated
squamous nonciliated
CO is harmful to human being because
it decreases CO2 concentration
it competes O2 to combine with haemoglobin
it is carcinogenic
it depletes O2 layer
