Homologous chromosomes are composed of both maternal and paternal chromosomes. Therefore, different alleles of the same gene can be found most of the times. On the other hand, sister chromatids are composed of same allele of a gene in both strands since they are synthesized by the DNA replication of a strand.
Are alleles on homologous chromosomes?
When chromosomes are homologous, it means that they are the same, at least in terms of the gene sequences and loci. … Homologous chromosomes have alleles on the same genes located in the same loci. Heterologous chromosomes have alleles on different genes.
Do sister chromatids separate during meiosis?
Meiosis II is the second division of meiosis. It occurs in both of the newly formed daughter cells simultaneously. Meiosis II is similar to Mitosis in that the sister chromatids are separated.
What is the difference between sister and non-sister chromatids?
A sister chromatid is either one of the two chromatids of the same chromosome joined together by a common centromere. … Non-sister chromatids, on the other hand, refers to either of the two chromatids of paired homologous chromosomes, that is, the pairing of a paternal chromosome and a maternal chromosome.
Where do homologous chromosomes come from?
Homologous chromosomes have corresponding DNA sequences and come from separate parents; one homolog comes from the mother and the other comes from the father. Homologous chromosomes line up and synapse during meiosis.