Question

Which of the following statements is FALSE?

1) Sister chromatids of the same chromosome are identical.
2) Sister chromatids can be on nonhomologous chromosomes.
3) Homologous chromosomes are not necessarily identical.
4) An example of a nonhomologous chromosome pair is paternal chromosome 1 and paternal chromosome 2 in a human.

Answer 1

The false statement is that sister chromatids can be on nonhomologous chromosomes. Sister chromatids are always identical and attached to the same chromosome, whereas nonhomologous chromosomes are different and carry distinct sets of genes.

Step-by-step explanation:

The statement that is FALSE is: "Sister chromatids can be on nonhomologous chromosomes." Sister chromatids are identical copies of a single chromosome that are connected by a centromere; they are not found on nonhomologous chromosomes. Nonhomologous chromosomes, like paternal chromosome 1 and paternal chromosome 2 in a human, are not similar and carry different sets of genes. On the other hand, homologous chromosomes carry the same genes in the same linear order but may have different alleles; they are similar but not identical. During mitosis and during the first division of meiosis, homologous chromosomes and sister chromatids behave differently in their distribution to daughter cells.