Homologous Chromosomes: Homologous chromosomes may contain same or different alleles of the same gene. Thus, the gene sequence is not identical at all the times. Sister Chromatids: Sister chromatids contain identical gene sequence throughout the chromatids except in the chromosomal crossover.
Are alleles on sister chromatids or homologous chromosomes?
Sister chromatids are formed during DNA replication therefore they are identical, that is, they are literally copies of each other – the same genes AND the same alleles.
Do homologous chromosomes have to have the same alleles?
The two chromosomes in a homologous pair are very similar to one another and have the same size and shape. Most importantly, they carry the same type of genetic information: that is, they have the same genes in the same locations. However, they don’t necessarily have the same versions of genes.
Do non sister chromatids have the same alleles?
Non-sister chromatids are chromatids of homologous chromosomes. … These chromatids contain the exact same genes and the exact same alleles – the chromatids are exact copies of each other.
What are differences between homologous chromosomes?
Although both are very similar, the difference between the two is the pairing. Homologous chromosomes are basically two similar chromosomes inherited from father and mother. … During meiosis, the homologous chromosomes pair up during first prophase. When they do so, the homologous pair becomes known as a bivalent.
Can alleles be on different chromosomes?
An allele is one of two, or more, versions of the same gene at the same place on a chromosome. It can also refer to different sequence variations for several-hundred base-pair or more region of the genome that codes for a protein. Alleles can come in different extremes of size.
What is it called when homologous chromosomes have different alleles on them?
One chromosome of each homologous pair comes from the mother and one comes from the father. Each carries the same genes in the same order, but the alleles for each trait may not be the same. … Heterozygous means having one each of two different alleles.
What is the same in all parts of homologous chromosomes?
Homologous chromosomes are similiar but not identical. Each carries the same genes in the same order, but the alleles for each trait may not be the same. … The maternal and paternal chromosomes in a homologous pair have the same genes at the same loci, but possibly different alleles.
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.