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?
How much Chopped, or Sliced is in a Onion. White and yellow onions run about the same size; there are 6 small onions (about 2.5 ounces each), 4 to 5 medium onions (about 3 to 3.5 ounces each), or 3 large onions in 1 pound. For our test sample, we used 1 medium onion.