After the third dose -- given at age 6 months -- your child will be 80% to 85% immune to whooping cough for 3 to 5 years. Everyone -- including adults -- from age 11 up should receive a booster vaccine, called Tdap. It's a combined tetanus, diphtheria, and pertussis booster vaccine.
How many chromosomes are in the nucleus of an onion root cell? There are 8 chromosomes in the nucleus of an onion root cell. The cells are undergoing mitosis, during which the amount of DNA is doubled even as the number of chromosomes â¦ remains constant. How many chromosomes do onions have?
Extraction of DNA from White Onion. Introduction: Deoxyribonucleic acid (DNA) is the genetic material of all organisms. It is the master molecule in whose structure is encoded all information needed to create and direct the chemical machinery of life (Micklos and Freyer, 1999). Today, scientists can analyze DNA from minute samples of blood, hair roots and saliva.