Lesson 342 of 1524
Cell Reproduction
Human gametes have 23 chromosomes representing one complete set of chromosomes; a set of chromosomes is complete with either one of the sex chromosomes.
Practice this chapterHuman gametes have 23 chromosomes representing one complete set of chromosomes; a set of chromosomes is complete with either one of the sex chromosomes. An organism’s traits are determined by the genes inherited from each parent.
Genes are segments of DNA that code for a specific protein. Duplicated chromosomes are composed of two sister chromatids.
chromatid — single DNA molecule of two strands of duplicated DNA and associated proteins held together at the centromere. cell cycle — ordered series of events involving cell growth and cell division that produces two new daughter cells. gene — physical and functional unit of heredity, a sequence of DNA that codes for a protein. gamete — haploid reproductive cell or sex cell (sperm, pollen grain, or egg).
Worked example
What does “chromatid” mean in Cell Reproduction?
- 1Use the wording this chapter gives for chromatid.
- 2The book says: single DNA molecule of two strands of duplicated DNA and associated proteins held together at the centromere.
- 3Do not use the meaning of cell cycle. That term means ordered series of events involving cell growth and cell division that produces two new daughter cells.
Result: single DNA molecule of two strands of duplicated DNA and associated proteins held together at the centromere
Why. That is the meaning this chapter gives for chromatid.
Do not swap chromatid and cell cycle. chromatid means single DNA molecule of two strands of duplicated DNA and associated proteins held together at the centromere. cell cycle means ordered series of events involving cell growth and cell division that produces two new daughter cells.
Practice margin
This chapter
A fresh set from this chapter only. Choose 10 or 20. Multiple choice and fill-in, with no repeat inside the set.