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When DNA replication takes place without subsequent cell division, polytene chromosomes may result. These are giant chromosomes comprised of multiple chromatids (identical chromosome copies) arranged together like strands of a large cable. They are commonly found in the salivary glands of the fruit fly (Drosophila melanogaster) and are regions of active transcription.
What else can I help you with?
Are tetrad and homologous chromosomes the same?
No, tetrad refers to a group of four chromatids that are formed during meiosis by pairing of homologous chromosomes. Homologous chromosomes are chromosome pairs that code for the same traits but may have different alleles.
In humans when a new cell is formed from a sperm cell an egg cell how many chromosomes does it have?
i think 26 i think 26 46 chromosomes. The sperm cell and egg cell each contain 23 chromosomes, totalling 46. The sperm cells and egg cells are known as haploid cells or sex cells (meaning having 1 set of chromosomes). Once the sperm cell and egg cell joins, a diploid cell is formed (meaning having 2 sets of chromosomes), and a zygote begins to form. The human body contains 2 sets of chromosomes, one maternal and one paternal.
A tetrad is composed of?
Tetrads are formed of 2 homologous chromosomes, which are crossing over so there is a total of 4 chromatids. :D
Organelle formed from chromatin as a cell divides?
Chromosomes are formed from condensed chromatin as a cell divides during mitosis. Chromosomes are the structures that contain the genetic material (DNA) and are replicated and divided equally between the daughter cells to ensure proper genetic inheritance.
How many chromosomes are in cells formed during mitosis?
A cell undergoing mitosis has twice the usual number of chromosomes for that species. For example, human body cells have 46 chromosomes, but after DNA replication, which must occur before mitosis, a human body cell will have 92 chromosomes.
Do fruit flies have giant chromosomes?
Yes, fruit flies (Drosophila melanogaster) have giant chromosomes known as polytene chromosomes. These chromosomes are found in specific tissues, like salivary glands, and are formed by multiple rounds of DNA replication without cell division, resulting in thick, banded structures. Polytene chromosomes are useful for genetic studies because their distinct bands allow researchers to easily identify genes and study chromosomal mutations.
In which animal polytene chromosome was discovered?
The polytene chromosome was first discovered in the salivary glands of the larvae of fruit flies (Drosophila melanogaster). These chromosomes have characteristic banding patterns due to repeated DNA strands that have replicated side by side.
What has the author Dahlia Arielle Kasimer written?
Dahlia Arielle Kasimer has written: 'Localization of general transcription factors and RNA polymerase II on Drosophila polytene chromosomes'
The polytene chromosomes of certain insect larvae churn out copious amounts of gene products because?
they undergo endoreplication, resulting in multiple rounds of DNA replication without cell division. This leads to the amplification of gene copies and an increase in gene product production. Additionally, the structure of polytene chromosomes allows for high levels of gene transcription due to their large size and many chromosomal bands.
How many chromosomes are in a cell that was formed from a sperm and egg cell?
Twenty-three chromosomes are in a cell that is formed from a sperm and egg cell.
Was hybridization the ultimate source of genetic variability?
Often in reproduction, broken chromosomes are formed by random natural factors. When these combine with other chromosomes, new characteristics can be formed which are different from the Natural Chromosomes.
What formed element does not have chromosomes?
The formed element that does not have chromosomes is the red blood cell (erythrocyte). Red blood cells are lacking in a nucleus and do not contain chromosomes or genetic material. This feature allows them to maximize their capacity for carrying oxygen.
What part of the nucleus is chromosomes formed from?
From DNA.
What DNA molecules are formed into structures?
Chromosomes
How does the number in chromosomes in sex cells compare to the number of chromosomes in cells formed during mitosis?
it compares by 50% or by half of chromosomes because there are 23 sex cells and 46 chromosomes
How does the number of chromosomes in sex cell compare to the number of chromosomes in cells formed during mitosis?
it compares by 50% or by half of chromosomes because there are 23 sex cells and 46 chromosomes
How does the number of chromosomes in sex cells compare to the number of chromosomes in cells formed during mitosis?
it compares by 50% or by half of chromosomes because there are 23 sex cells and 46 chromosomes
