Best answer: What is the term for a pair of homologous chromosomes with sister chromatids?

What is a pair of homologous chromosomes called?

In metaphase I of meiosis I, the pairs of homologous chromosomes, also known as bivalents or tetrads, line up in a random order along the metaphase plate. … Meiotic spindles emanating from opposite spindle poles attach to each of the homologs (each pair of sister chromatids) at the kinetochore.

What is it called when sister chromatids are attached to each other?

A sister chromatid refers to the identical copies (chromatids) formed by the DNA replication of a chromosome, with both copies joined together by a common centromere. In other words, a sister chromatid may also be said to be ‘one-half’ of the duplicated chromosome. A pair of sister chromatids is called a dyad.

What do you mean by homologous chromosomes?

Homologous chromosomes: A pair of chromosomes that contain the same gene sequences, each derived from one parent.

What does it mean to say that two chromosomes are homologous?

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.

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How are sister chromatids and homologous chromosomes different from each other?

They are not different. Homologous chromosomes and sister chromatids are both identical copies of each other. … 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.

What is meant by sister chromatids?

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 is the point of attachment for sister chromatids?

Explanation: centromeres. … that holds together the two chromatids (the daughter strands of a replicated chromosome). The centromere is the point of attachment of the kinetochore, a structure to which the microtubules of the mitotic spindle become anchored.

What holds the sister chromatids tightly together?

During DNA duplication in the S phase, each chromosome is replicated to produce two identical copies, called sister chromatids, that are held together at the centromere by cohesin proteins. Cohesin holds the chromatids together until anaphase II.