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?
Best Answer: This is like asking how long is a piece of string because onions can vary in size so much. But a medium-sized onion would be something between 100 to 150 grams once it's peeled. If you're following a recipe, I would say that you don't have to get the weight of the onion exactly right, I rarely weigh onions, I just judge how much I need by eye (ie size of the onion). Source(s): Miggy Â· 5 years ago. Thumbs up.