A mutation is one form of genetic variation.
The genotype of a normal male zygote is XY, with the X chromosome (sex chromosome) coming from the mother and Y from the father.
The atmosphere is divided into different regions, called layers. The layer closest to the surface is known as troposphere, after which comes the stratosphere. The stratosphere begins at an altitude of 10 miles above the surface of the earth and stretches up to 31 miles above the surface of the earth. It is the second layer of the atmosphere (beginning from the surface of the earth) and it is the region which contains ozone, which plays a vital role in stopping ultraviolet radiation from reaching the earth's surface.
Answer: Option B
Explanation:
The Eukaryotes, Bacteria and Archaea were firstly thought to be belonging to same kingdom as their characters were very much similar.
Until their DNA sequence were used as a basis of their distinction they were put into similar criteria. Due to advanced research their DNA sequence were analyzed and then it was found that the three organism are different.
So, the correct answer is option B
