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 or bulb onion is a widely cultivated vegetable belonging to genus Allium. The exact origin of onion is unknown but it is known to be cultivated since long ( about 7000 years ago). There are many varieties of onions like red onion, yellow onion, green onion etc. Onions are used both as a vegetable and as well as salad. Being a good source of many nutrients like minerals,vitamins,antioxidants, dietary fibers, phytochemicals,phytonutrients etc. they provide a number of health benefits.