How many chromosomes are in a normal human body cell?
Answer and explanation
Correct answer: A. 46
Humans have 23 pairs of chromosomes, so 46 in every body cell.
Answer: 46.
Why not the others: 23: that is the number in a gamete. 44: that is the number of autosomes. 48: it is the chromosome number in some other apes.
Answer: 46.
Why not the others: 23: that is the number in a gamete. 44: that is the number of autosomes. 48: it is the chromosome number in some other apes.
Practise more Genetics and Evolution.
Free questions with an explanation for every one, and full timed HKDSE (Hong Kong) mock tests.
More Genetics and Evolution questions
- Which base pairs with adenine in DNA?
- In pea plants, tall (T) is dominant to dwarf (t). What proportion of the offspring of a cross Tt x Tt is expected to be dwarf?
- A woman who is a carrier of red-green colour blindness (X-linked recessive) has children with a man of normal vision. What is the chance tha…
- Which type of cell division produces gametes?
- Which of these is a source of variation in sexual reproduction?
- Which structure carries the genetic code from DNA in the nucleus to the ribosome?