Cellular Reproduction

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Questions and Answers

What is the function of the centromere during cell division?

  • It contributes to the formation of new chromosomes.
  • It allows DNA to replicate.
  • It initiates the process of cell division.
  • It holds chromatids together. (correct)

What term is used to describe half of a chromosome?

  • Chromatid (correct)
  • Gene
  • Chromosome
  • Centromere

How many total chromosomes do humans have?

  • 23 chromosomes
  • 44 chromosomes
  • 46 chromosomes (correct)
  • 48 chromosomes

Which of the following describes sex chromosomes in humans?

<p>Females have two X chromosomes. (A)</p> Signup and view all the answers

What happens to DNA during cell divisions?

<p>DNA is replicated and tightly coiled. (C)</p> Signup and view all the answers

Flashcards

DNA between cell divisions

DNA is in a relaxed state, not condensed into visible structures.

Chromosome

A tightly packed structure of DNA and proteins that forms during cell division.

Chromatid

One half of a duplicated chromosome.

Centromere

The constricted area of a chromosome where the two chromatids are held together.

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Human chromosome number

Humans have 23 pairs of chromosomes, totaling 46.

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Study Notes

Cellular Reproduction

  • DNA exists in a chromosome form between cell divisions
  • Chromosomes form during cell division
  • DNA coils tightly around proteins
  • Half of a chromosome is called a chromatid
  • The constricted area of each chromatid is called the centromere
  • The centromere holds chromatids together until cell division
  • Humans have 46 chromosomes
  • Sex chromosomes determine sex
  • Females have XX chromosomes
  • Males have XY chromosomes

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