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?
Now weâre going to do an experiment to determine how much time cells spend in each phase of cell division. Letâs count the number of cells in some onion root tips during each phase, and use this information to answer the question. On this slide, there are 21 cells in interphase, 4 in prophase, 2 in metaphase, and 1 in telophase. Why are most of the cells in interphase? Recall that interphase makes up the majority of the cell cycle. Letâs look at another slide. In this slide, there are 16 cells in interphase, 1 in prophase, and 1 in anaphase. Go ahead and try characterizing the cells yourself. Good job! Good going! Youâve got it! Nicely done! Thatâs right! Sorry, thatâs not correct. This cell is in interphase.