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What is the name for each of the two identical parts of a double chromosome?
chromatid
How can you tell the difference between the original and replicated part of each chromosome?
In late anaphase and G1 of interphase, a chromosome is unreplicated and consists of a single DNA double helix. A replicated chromosome contains two identical DNA double helices.
What are the two strands of a double stranded chromosome called?
The two strands of a double-stranded chromosome are called chromatids. Each chromatid contains a single DNA molecule that is duplicated and bound to its sister chromatid at the centromere.
How many DNA molecules are in a chromosomes?
There is one double helix DNA molecule per chromosome.
What would happen if sex cells were not haploids?
The chromosome number would double throughout each generation.
How many chromosome are in a diploid (double or 2n) set for humans?
A diploid set for humans consists of 46 chromosomes. This means there are 23 pairs of chromosomes, with one chromosome from each pair inherited from each parent.
Each human chromosome is replicated in about how many sections?
Each human chromosome is typically replicated in multiple sections called replication origins. These origins are sites along the chromosome where the DNA double helix unwinds and new DNA strands are synthesized during DNA replication.
What does a double stranded chromosome mean?
A double-stranded chromosome refers to the structure of a chromosome that consists of two intertwined strands of DNA, each strand representing a long chain of nucleotides. These strands are held together by complementary base pairing between nucleotides, forming the characteristic double helix shape. During cell division, chromosomes replicate and become visible as distinct entities, with each chromosome composed of two sister chromatids joined at a region called the centromere. This structure is essential for the accurate segregation of genetic material during cell division.
Gene A occurs on chromosome 5 gene B on chromosome 21 Therefore these two parts of a chromosome cannot be what?
The two genes are located on different chromosomes and therefore cannot be considered part of the same chromosome. Each chromosome consists of a single linear double-stranded DNA molecule and may contain numerous genes.
When does the chromosome number double?
The chromosome number only doubles when two haploid gametes form to produce a diploid zygote. Example: In humans, sperm cells and eggs have 23 chromosomes, the haploid number. Once they fuse, the number doubles to 46 chromosomes. You may be confusing this with chromosome replication. In chromosome replication, the number of chromosomes does not double, but the number of strands double. (A single stranded chromosome turns into a double stranded chromosome.) However, it is still considered a single chromosome, but with identical sister chromatids. This replication occurs during the S-phase of the cell cycle, before mitosis or meiosis.
When is s phase complet?
S phase is complete when each chromosome has been duplicated.
How many chromatids does each chromosome have before S-phase?
There are two chromatids for each chromosome before the S-phase. The S-phase is wherein DNA of each chromosome is replicated.
