The position of the centromere and the overall size of each chromosome are useful because they
Correct answer: A. allow chromosomes to be identified in a karyotype
- A. allow chromosomes to be identified in a karyotype
- B. change from one cell division to the next
- C. by themselves determine the sex of the individual
- D. are identical for every chromosome in the cell
Explanation
Since each chromosome type has a characteristic length and centromere position, these features let cytogeneticists arrange a karyotype in standard order and spot missing or extra chromosomes. Sex is determined specifically by the X and Y pair, not by size alone.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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