MCQ
The disease, sickle-cell anaemia, is caused by:
- AMalarial infection
- BIron deficiency
- CPoor hygiene
- DNone of the above
Explanation:
Sickle cell anaemia is caused by a genetic mutation that affects the normal development of haemoglobin. A genetic mutation is a permanent change in the normal pattern of genetic information inside all living cells. Abnormal haemoglobin, called haemoglobin S, causes sickle cell disease (SCD). When the haemoglobin S gene is inherited from only one parent and a normal haemoglobin gene is inherited from the other, a person will have sickle cell trait.
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$(1)$ The process of fusion of a sperm with an ovum is called fertilisation
$(2)$ $LH$ surge induces rupture of graffian follicle
$(3)$ $8$ cells embryo is called morula
$(4)$ Length of fallopian tube is $8-10 \,cm$
$R$ : This intercalating agent absorbs light in range $260 -330 \;nm.$