Chromosome Number: Haploid, Diploid & The Math
15 exam-style questions. Reveal answers one by one, or reveal all at once.
State the term used to describe a nucleus containing a single set of unpaired chromosomes.
State the term used to describe a nucleus containing two sets of chromosomes (one from each parent).
What is the correct biological term for the process by which a haploid egg and a haploid sperm join to form a diploid zygote?
What term describes the reproductive cells (e.g. sperm and egg) that are always haploid?
What term is used for the fertilised egg cell that is the result of fertilisation and is diploid?
Are the nuclei of gametes haploid or diploid? Explain why this is essential.
Is the nucleus of a zygote haploid or diploid? State how this is achieved.
A student states: 'All cells in the human body are diploid.' Identify the error in this statement.
By what type of cell division are gametes produced? Why is this division type necessary?
State whether the cells produced by mitosis from a diploid body cell will be haploid or diploid.
A human body cell contains 46 chromosomes. How many chromosomes are found in a human sperm cell?
An egg cell of a mouse contains 20 chromosomes. How many chromosomes will be found in a mouse body cell?
An egg cell of a mouse contains 4 chromosomes. How many chromosomes will be in the zygote after fertilisation?
A plant body cell contains 24 chromosomes. How many chromosomes will be found in its pollen grain (male gamete)?
After fertilisation, a zygote of a certain species contains 36 chromosomes. How many chromosomes does each gamete of this species contain?
Quick Reference — The Golden Rule
n
Haploid
Gametes (sperm, egg)
2n
Diploid
Body cells, zygote
n + n = 2n
Fertilisation
Restores diploid number
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