Homologous chromosomes are a couple of one maternal and one paternal chromosome, paired up during fertilization in a diploid cell. Two copies of one chromosome, linked together in the centromere are called sister chromatids. … For most of the cell’s life, each chromosome is composed of one DNA molecule.
What is the difference between homologous chromosomes and sister chromatids quizlet?
Homologous chromosomes contain the same gene loci but may have different alleles of a particular gene. Sister chromatids are identical copies of each other produced during DNA replication. One homologous chromosome comes from the father, and the other comes from the mother.
What are sister chromatids simple definition?
Medical Definition of sister chromatid
: either of the two identical chromatids that are formed by replication of a chromosome during the S phase of the cell cycle, are joined by a centromere, and segregate into separate daughter cells during anaphase.
What does it mean when chromosomes are considered homologous?
1. A pair of chromosomes made up of two homologs. 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. 2.
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.
How do you identify homologous chromosomes?
In biology, homologous chromosomes are paired chromosomes. They essentially have the same gene sequence, loci (gene position), centromere location, and chromosomal length. Although they may have the same genetic sequence and loci, they may differ in alleles.