Your question: Do homologous chromosomes have identical sequences of DNA?

Do chromosomes contain identical DNA molecules?

Chromosomes were first named by cytologists viewing dividing cells through a microscope. … In G2, after DNA replication in S phase, as cell enter mitotic prophase, each chromosome consists of a pair of identical sister chromatids, where each chromatid contains a linear DNA molecule that is identical to the joined sister.

How many DNA is in a chromosome?

One chromosome has 2 strands of DNA in a double helix. But the 2 DNA strands in chromosomes are very, very long. One strand of DNA can be very short – much shorter than even a small chromosome. Strands of DNA are made by joining together the 4 DNA bases in strings.

Are chromosomes separate strands of DNA?

Image of a long, double-stranded DNA polymer, which wraps around clusters of histone proteins. The DNA wrapped around histones is further organized into higher-order structures that give a chromosome its shape. … Instead, it’s broken up into separate, linear pieces called chromosomes.

How many DNA molecules are typically contained in each human chromosome?

Each chromosome contains a single very long, linear DNA molecule. In the smallest human chromosomes this DNA molecule is composed of about 50 million nucleotide pairs; the largest chromosomes contain some 250 million nucleotide pairs. The diploid human genome is thus composed of 46 DNA molecules of 24 distinct types.

IT IS INTERESTING:  Which type of gametes are formed in spirogyra?