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?
Onion with bacterial disease. All photos: Mary Hausbeck, MSU. Bacterial diseases of onion were a limiting factor for yields in 2012 for growers in Allegan and Ottawa counties. Bacterial leaf blight (Pantoea agglomerans) and bacterial center rot (Pantoea ananatis) were isolated from 85 samples of onions from both counties.