DNA condenses into chromosomes; chromosomes carry genes; genes “write” traits.
1. What best describes DNA in a cell?
2. What are genes?
3. How many chromosomes are found in a typical human cell?
DNA — definition?
Genetic material carrying hereditary info.
Chromosomes — role?
Contain DNA and genes inside the nucleus.
Genes — function?
Determine inherited traits.
Chromosome number — humans?
46 chromosomes, 23 pairs.
Sex chromosomes — XY or XX?
XY for male, XX for female.
Trisomy 21 — meaning?
Extra chromosome in pair 21.
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