Questions

Random fluctuations in the gene frequencies within a population Eliminate is the one which best describes genetic drift.

Matching blood group before marriage is important. This is to prevent Rh incompatibility. Rh incompatibility can lead to erythroblastosis fetalis (Hemolytic disease of the newborn-HDN). Fetal RBC gets destroyed & newborn may get severe anaemia, jaundice. This jaundice is more severe than Physiological jaundice ( which is the most common and will usually resolve on its own).

In very severe form, a fetus may die due to heart failure. This is mediated by the antigen-antibodies reaction. Transfer of maternal antibodies across the placenta occurs. This happens when Rh +ve man marries Rh-ve lady.

So Rh +ve man should try to avoid marrying Rh-ve lady.

Matching blood groups for marriage ::

Boy : A = Girl : A & AB 

Boy : B = Girl : B & AB 

Boy : O = Girl : O, A, B & AB 

Boy : AB = Girl : AB 

Boy : Rh+ve = Girl : Rh+ve 

Boy : Rh-ve = Girl : Rh+ve & Rh-ve.

Blood groups that do not match for marriage ::

Boy : A = Girl : O & B 

Boy : B = Girl : O & A 

Boy : AB = Girl : O, A & B 

Boy : Rh+ve = Girl : Rh-ve.

The address bus is unidirectional because the address information is always given by the micro processoe  to address a memory location of an input / output devices.

In Germany, Kaiser means 'Emperor'. On 18th January, 1871 Wilhelm I was declared as Kaiser of Germany.

House of representatives has the power of impeachment in the office.

Here all the above given options are the countries with no income tax.

List of Countries With No Income Tax:

- Qatar

- Oman

- UAE

- Saudi Arabia

- Bahrain

- Kuwait

- Bermuda

- Cayman Islands

- Bahamas

- Monaco.

Norway is called as the land of midnight sun.