Metaphase. What's the difference? Whether it's IN homologous or NOT, they're both Metaphase..... Stupid worksheet. I hate you group 3. :(
Fruit flies are prolific breeders, have 4 pairs of chromosomes, and have easily distinguishable chromosomes.
There are 22 autosomal chromosomes and 2 sex chromosomes in humans. In all the other chromosomes, the homologous pairs match up genetic loci. However, in human sex chromosomes the X and Y chromosome are different (with the X chromosome being much larger and the Y chromosome carrying genes that cause "maleness"). Someone with an X and a Y chromosome is a male because he has a Y chromosome that carries the genes that code for "maleness". Females "lack" this Y chromosome, and thus show characteristic female phenotypes.
Occurs during prophase I of meiosis (pachytene) in a process called synapsis. Crossover usually occurs when matching regions on matchingchromosomes break and then reconnect to the other chromosome. The value of crossing over is that each parent has a different daughter cell.
when cell division occurs chromosomes segregate & also the genes present in pairs on then as the genes store genetic information it is kept constant though cell division
They may be called several things. They could be called Chromosomes (however these are when the genetic information has been aggregated into bodies (usually resembling an X). It can be called DNA (meaning deoxyribonucleic acid) which is the long strand of information made of up base pairs which resembles a twisted ladder. A small segment of that ladder which produces only one protein may be called a Gene. (from whence we get the term genetics). When DNA is being used to make pieces of the cell and produce stuff in genera, it is transcoded into RNA (Ribonucleic Acid) which is a temporary form of the genetic information which can be taken from the nucleus of the cell where the DNA is stored and turned into protein elsewhere. This form of RNA is known as Messenger (m)RNA. containing genetic information: Chromatin condenses to form chromosomes. These distinct, threadlike structures contain the genetic information or DNA.
AnaPhase1
pairs of homologous chromosomes move to the equator of the cell
metaphase I of meiosis
There are two chromosome that are at the metaphase II equator. Chromosomes are already duplicated and are homologous pairs in Metaphase II.
Humans have a total of 23 pairs of homologous chromosomes.
The cells that have pairs of homologous chromosomes are called diploid cells.
Homologous chromosomes
At the end of metaphase I, the homologous pairs of chromosomes line up along the cell's equator. This alignment allows for the independent assortment of genetic material during anaphase I, where the homologous chromosomes separate and move to opposite poles of the cell.
The total number of chromosomes in a cell with homologous pairs is twice the number of unique chromosomes. For humans, the total number of chromosomes in a cell with homologous pairs is 46.
Leopard frogs have 13 pairs of homologous chromosomes, for a total of 26 chromosomes.
Homologous pairs of chromosomes are not normally found in gametes, which are reproductive cells such as eggs and sperm. This is because gametes are haploid, meaning they only contain one set of chromosomes, while homologous pairs consist of two sets of matching chromosomes.
there are 23 pairs of matching chromosomes 46 chromosomes altogether.