The true statements about homologous chromosomes are:
- They are about the same size.
- Homologous chromosomes contain the same types/sequences of genes.
The other statements are not true for homologous chromosomes:
- One is big and one is small. (This is not true; homologous chromosomes are generally similar in size.)
- They have different sequences of genes and different structures. (While they may have different alleles for some genes, homologous chromosomes contain the same types of genes, though those genes may vary in alleles.)
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