Human haploid number?
Reveal answer
23.
Key words: 23
4(b) INHERITANCE · RECALL
4.32 Human diploid and haploid numbers
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Human diploid number?
Reveal answer
46.
Key words: 46
Why does a zygote have 46 chromosomes?
Reveal answer
Egg 23 + sperm 23 = 46.
Key words: 23
What is meant by the term chromatid?
Reveal answer
One replicated copy of a chromosome before separation.
Key words: chromatid
Human chromosome numbers: for Body cell before replication, give the chromosome number and the ploidy.
Reveal answer
Chromosome number: 46. Ploidy: Diploid.
Key words: Body cell before replication
Human chromosome numbers: for Gamete, give the chromosome number and the ploidy.
Reveal answer
Chromosome number: 23. Ploidy: Haploid.
Key words: Gamete
Human chromosome numbers: for Zygote, give the chromosome number and the ploidy.
Reveal answer
Chromosome number: 46. Ploidy: Diploid.
Key words: Zygote
Human chromosome numbers: for Body cell after DNA replication, give the chromosome number and the ploidy.
Reveal answer
Chromosome number: 46 chromosomes/92 chromatids. Ploidy: Diploid.
Key words: Body cell after DNA replication
Human chromosome numbers: for Cell after mitosis, give the chromosome number and the ploidy.
Reveal answer
Chromosome number: 46. Ploidy: Diploid.
Key words: Cell after mitosis
True or false, and why? “Gametes have 46 chromosomes each.”
Reveal answer
False. They normally have 23.
True or false, and why? “Replication makes 92 chromosomes.”
Reveal answer
False. It makes 92 chromatids while chromosome count remains 46.
True or false, and why? “A zygote has 23 chromosomes.”
Reveal answer
False. It receives 23 from each gamete, making 46.
What does diploid mean?
Reveal answer
Having two sets of chromosomes (chromosomes in pairs).
Key words: two sets
What does haploid mean?
Reveal answer
Having one set of chromosomes.
Key words: one set
How many pairs of chromosomes are in a human body cell?
Reveal answer
23 pairs.
Key words: 23