A chromosome is made of both one DNA molecule wound around small protein molecules where DNA is just one large molecule called deoxyribose nucleic acid.
Each chromosome has two molecules of DNA. DNA is the chemical form which stores genetic information and a chromosome is the highest organized structure of DNA double helix with proteins.
During meiosis the male XY sex-chromosome pair separates and passes on an X or a Y to separate gametes; the result is that one-half of the gametes (sperm) that are formed contains the X chromosome and the other half contains the Y chromosome. ... The X chromosome, being larger, carries many more genes than does the Y.
In prokaryotes, the circular chromosome is contained in the cytoplasm in an area called the nucleoid. In contrast, in eukaryotes, all of the cell's chromosomes are stored inside a structure called the nucleus. Each eukaryotic chromosome is composed of DNA coiled and condensed around nuclear proteins called histones.
The correct answer is --Homologous chromosomes contain the same genes, but may contain different alleles. Sister chromatids contain the same genes and the same alleles.
Sister chromatids are the identical copies formed during the synthesis phase of the cell cycle that means both the sister chromatids share the same allele of a gene at the same locus on the chromosome. These sister chromatids are joined together by a centromere.
Homologous chromosomes are the set of chromosomes in which one chromosome comes from male parent and another chromosome from the female parent and both carry the same gene at the same locus but may contain different alleles of the gene because both chromosomes comes from different origin.
The main difference between autosomes and sex chromosomes is that autosomes are involved in determining the somatic characters of an individual and sex chromosomes are involved in determining the sex and the sex-related hormonal traits.
Also in linear chromosome there are telomeres at the end of the chromosomes and there is specific process for their replications and in the
circular chromosomes, there are no telomeres.
At the season of meiosis homologous chromosomes match up, may experience cossing over - hereditary trade between two non-sister chromatids. At meiosis I homologous chromosomes are segragated and at meiosis II sister chromatids are isolated.
the answer is d.) homologous; have mammary glands