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?
One small onion is a bit bigger than the size of a golf ball, while medium onions are about the size of an apple, perhaps a bit smaller. A golf ball has a diameter of 42.67mm, â¦ so let's say a small onion is 45mm. A medium one would be about 70. 70 / 45 = 1.55 One medium onion equals approximately 1.5 small onions.