Who discovered that the genes on a chromosome could change position?

A human body, as a single cell  consists of 23 DNA molecules from its father. How many molecules come  from its mother?

Shape of the DNA molecule appears:

How many chromosomes are there in human body?

Write the chromosome numbers of dogs.

Name the two scientists who invented the structure of DNA molecule.

Eggs and sperms join together to form:

The process of producing many identical organisms or clones is called:

Which part of the cell controls the growth and development of the cell?

Write the name of the sheep which was the first successfully cloned at the end of the 20^th century.