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Dictionary » H » Homologous chromosome Homologous chromosomeDefinition noun, plural: homologous chromosomes (Science: genetics) 1. one of a pair of chromosomes 2. a chromosome with the same gene sequence as another
In a biological cell, a chromosome pairs with another chromosome during meiosis. This pairing (synapsis) happens between two chromosomes that are homologous, i.e. chromosomes having the same genes at the same loci but possibly different alleles. For example, two chromosomes may have genes encoding eye color, but one may code for brown eyes, the other for blue. A human cell contains 23 pairs of homologous chromosomes: 22 of them are homologous non-sex chromosomes (or autosomes) and 1 homologous pair of sex chromosomes. In females, the homologous sex chromosomes are 2 X’s; in males the X and Y chromosomes.
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Results from our forumGenetics with Mitosis and Meiosis... cycle: G-1 S-phase G-2 M-phase (division) Mitosis: Before S-phase, each chromosome consists of one strand of DNA. The DNA is copied during S-phase. ... of the dividing cell. The two forms of a gene are present on the two homologous chromosomes, and the homologous chromosomes are what separate. ...
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How dominance works at the DNA/RNA/proteinThank you! I was getting confused between pairs of chromosomes and pairs of chromatids. I think I have a clearer mental model now: ... can be matched up in pairs. The two chromosomes in a pair are said to be homologous. One of those pairs codes for our gene. That is, if we examine one ...
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Re: cancers, chromosome mutationsI know chromosome mutations may also result in cancers. For instance, the trisomy, a condition that a person have 3 homologous chromosomes, increase the risk of having leukamia. But what is the principles beneath?
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Is this information correct? Regarding Mitosis and Meiosis... nuclear membrane breaks down as the DNA organised into what is known as chromosomes. In meiosis the chromosome synapse, this results in the mixing ... cells are produced. In meiosis 4 haploid cells are produced. In Mitosis homologous chromosome do not pair. In meiosis homologous chromosome pair ...
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recombination in chromosome... in the haploid gene set of gametes (or spores). This is because each chromosome swaps fragments whith its homologous companion during the first cell division of meiosis. Note that no new "data" ...
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