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?
It has also been used in traditional medicines since ancient times for its health promoting and curative properties. Botanically, onions belong to the Alliaceae family, in the genus, Allium and known scientifically as: Allium cepa. Onion is a small herb plant that grows to about 2 feet tall. Its underground globular bulb is actually a stem which consists of modified leaves arranged in whorls.