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 production (tonnes) 1 China: 22,300,000: 2 India: 19,299,000: 3 United States: 3,159,400: 4 Iran: 2,426,050: 5 Russia: 1,984,937: 6 Turkey: 1,904,846: 7 Egypt: 1,903,000: 8 Pakistan: 1,660,800: 9 Brazil: 1,299,815: 10 Mexico: 1,252,441: 11 Japan: 1,165,000: 12 Netherlands: 1,130,000: 13 Spain: 1,098,400: 14 Ukraine: 1,049,200: 15 South Korea: 1,035,076: 16 Bangladesh: 889,260: 17 Indonesia