Alleles - Gene, Homologous, Genetic, and Chromosomes - JRank Articles
Homologous chromosome is a pair of the same chromosome. Alleles are alternative form of a gene for a given trait. Pair of alleles is found in. Alleles are corresponding locations on a pair of chromosomes. genetic information -- require the interaction of several different genes, making the relationships among alleles more complex. What Is a Homologous Allele?. The alleles for a trait occupy the same locus or position on homologous chromosomes and thus govern the same trait. However . Genetics is the branch of science that deals with the inheritance of biological characteristics. genome click this.What is an ALLELE ?
In most organisms, a chromosome contains two strands of DNA united in a double-helix structure in which the bases of one strand bind to those of the other. The sequence of bases in one strand determines the sequence in the sister strand.
This is because only certain bases can pair with each other. Only some portions of a DNA strand -- the genes -- code for proteins. Chromosomes Chromosome proteins, called histones, tightly bind to the DNA double helix.
What is the relationship between a pair of homologous chromosome and a pair of alleles?
This binding compresses the long DNA molecules so that they fit within a cell. Humans contain 23 pairs of chromosomes, and if you unwound all the DNA from a human cell and placed it end to end, it would exceed six feet in length.
During cell division, a cell replicates its complement of chromosomes so that each daughter sell gets the full diploid set.
Sciencing Video Vault Genes and Alleles Genes appear throughout the length of each chromosome, and each chromosome pair has a unique set of genes.
What is the difference between a homologous chromosome and a tetrad?
You can only recognize genes from their information content -- the sequence of nucleotide bases. Otherwise, genes are indistinguishable from the rest of the chromosome.
The site of a gene on a chromosome is its locus. You can designate a locus by counting the number of bases from the beginning of the chromosome to the start of the gene. At the genetic level, alleles contain differing base sequences in their nucleic acid e.
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As a form of a gene, an allele carries the instructions for a particular variation of the gene's protein product. Although underlying genetic molecular complexities sometimes blur the differences in expression; nature also provides simple examples of alleles.
For example, a single gene may control the flower color of some plants. In such cases, one allele of the gene produces one color e. Alleles reside at corresponding locations on the chromosomes that constitute a chromosomal pair. Because alleles reside in specific regions of chromosomes, they can act as markers and are subject to the laws of inheritance resulting from the apportionment of homologous chromosomes chromosomes that match in terms of size, shape, and gene content during meiosis.
The alternative alleles that comprise an organism's genome are inherited, one allele from each parent.
The allele contained on the homologous chromosome derived from the mother is termed the material allele. The allele located on the homologous chromosome derived from the father is termed the paternal allele.
All diploid organisms have two alleles at a given locus on a pair of homologous chromosomes. Because haploid cells e.
What Is the Relationship Between a Chromosome & an Allele? | Sciencing
When the diploid condition is restored following fertilization the pair of alleles can be described as homologous alike or heterologous different. Accordingly, organisms that are homologous with respect to the alleles for a particular gene carry identical alleles for that gene.
In contrast, organisms described as heterozygous for a particular gene carry alleles that differ.