Virus

• The systematic study of Virus is called virology.
• A virus is both a living and non living, thus it’s a connecting link between living and non living.
• Viruses may infect all types of organisms; animals, plants, bacteria and archae.

Introduction to Botany

• The systematic study of plants and trees is called Botany.
• The ophrastus is called Father of Botany.

Sex Determination in Humans

The male sex chromosome in humans if XY; the female sex chromosome is XX. In the times of gamete buildup, in male of the sperms holds X chromosome while other half holds Y chromosome. In female all gametes contains only X chromosome. When a male gamete carrying X chromosome, fertilize and ova, the result zygote developed would be a female. And When a male gamete carrying Y chromosome, fertilize and ova, the result zygote developed would be a male.