Homologous chromosomes are chromosomes that share: The same structural features (e.g. same size, same banding patterns, same centromere positions) The same genes at the same loci positions (while the genes are the same, alleles may be different)
What 3 characteristics are used to identify homologous chromosomes?
Homologous chromosomes are made up of chromosome pairs of approximately the same length, centromere position, and staining pattern, for genes with the same corresponding loci.
What is characteristic of homologous chromosomes quizlet?
Chromosome pairs (one from each parent) that are similar in length, gene position-banding, and centromere location. Homologous chromosomes are similar but not identical. Each carries the same genes in the same order, but the alleles for each trait may not be the same.
What are the 3 criteria used to categorize chromosome types?
In a given species, chromosomes can be identified by their number, size, centromere position, and banding pattern. In a human karyotype, autosomes or “body chromosomes” (all of the non–sex chromosomes) are generally organized in approximate order of size from largest (chromosome 1) to smallest (chromosome 22).
What makes homologous chromosomes homologous?
Homologous chromosomes are chromosome pairs, one from each parent, that are similar in length, gene position and centromere location. … They have the same genes but not necessarily the same alleles, so they could carry hair color, one with brown the other with blonde. So, homologous chromosomes share the same gene.
What are four characteristics of homologous chromosomes?
In biology, homologous chromosomes are paired chromosomes. They essentially have the same gene sequence, loci (gene position), centromere location, and chromosomal length.
What is a characteristic of the human Y chromosome?
The Y chromosome contains a “male-determining gene,” the SRY gene, that causes testes to form in the embryo and results in development of external and internal male genitalia.
What are three ways genetic variation can be achieved?
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism’s offspring).
What is a telomere and what does it do?
A telomere is a repeating DNA sequence (for example, TTAGGG) at the end of the body’s chromosomes. The telomere can reach a length of 15,000 base pairs. Telomeres function by preventing chromosomes from losing base pair sequences at their ends. They also stop chromosomes from fusing to each other.
What is the morphology of chromosome?
1. CHROMOSOME Chromosomes are the rod-shaped ,filamentous bodies present in the nucleus, which become visible during cell division. They are carriers of the gene or unit of heredity. Chromosome are not visible in active nucleus due to their high water content , but are clearly seen during cell division.
What are the three steps taken to create a karyotype?
To make a karyotype, scientists take a picture of the chromosome from one cell, cut them out, and arrange them using size, banding pattern, and centromere position as guides.