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.
Inheritance — process?
Transfer of genetic traits from parents.
Chromosome contribution — parents?
Half from mother, half from father.
Mutation — effect?
Changes DNA, may produce new traits.
Alleles — definition?
Different versions of the same gene.
Eye color alleles — outcomes?
M+M=M, B+B=B, M+B=M.
Blood group alleles — outcomes?
A+A=A, B+B=B, O+O=O, A+B=AB, A+O=A, B+O=B.
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1. What best describes DNA in a cell?
2. What are genes?
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