Chromosome in a sentence

An example of facultative heterochromatin is X chromosome inactivation in female mammals: one X chromosome is packaged as facultative heterochromatin and silenced, while the other X chromosome is packaged as euchromatin and expressed.

The Bacillariodnaviridae infect diatoms and have a unique genome: the major chromosome is circular (~6 kilobases in length): the minor chromosome is linear (~1 kilobase in length) and complementary to part of the major chromosome.

There are other reasons why the Y chromosome degrades, and is therefore likely to disappear, for example the fact that this chromosome is passed down from generation to generation only in the testes.

We found over the last ten years or so no generational issues, no gen- Xer's, no Y chromosome, X chromosome, no male, female, no age issue, no agency issue.

At the end of each chromosome is a repetitive DNA sequence, called a telomere, that caps the chromosome and protects its ends from deteriorating.

Also relevant in determining if the replicon is a chromosome is whether it represents a significant percentage of the genome, and chromosome 2 is 40% by size of the entire genome.

An incident in chromosome separation during anaphase II (of meiosis II ) called nondisjunction can result in sperm cells with an extra copy of the Y-chromosome.

Chromosomal ends might also be processed as breaks in double-strand DNA with chromosome-to-chromosome telomere fusions resulting.

Chromosome linkage studies Chromosome linkage studies of sexual orientation have indicated the presence of multiple contributing genetic factors throughout the genome.

Gay brothers who showed this maternal pedigree were then tested for X chromosome linkage, using twenty-two markers on the X chromosome to test for similar alleles.

Human chromosomes Chromosomes in humans can be divided into two types: autosomes (body chromosome(s)) and allosome ( sex chromosome (s)).

Humans Human male XY chromosomes after G-banding In humans, half of spermatozoons carry X chromosome and the other half Y chromosome.

In humans, examples include having a single extra chromosome (such as Down syndrome ), or missing a chromosome (such as Turner syndrome ).

Men do not have a second X chromosome to override the chromosome that carries the mutation.

Most monosomic and trisomic human embryos are not viable, but some aneuploidies can be tolerated, such as trisomy for the smallest chromosome, chromosome 21. Phenotypes of these aneuploidies range from severe developmental disorders to asymptomatic.

Otherwise, the fetus usually develops into a female, typically when the fetus has an X chromosome from the father, but also when the father contributed neither an X nor Y chromosome.

Recent studies using genome-wide scan revealed two quantitative trait loci on chromosome 9 and chromosome 18 may be responsible for genetic predisposition or susceptibility to infection of T. trichiura by some individuals.

Regarding mitotic chromosome structure, centromeres represent a constricted region of the chromosome (often referred to as the primary constriction) where two identical sister chromatids are most closely in contact.

Sperm cells that give rise to female (XX) offspring after fertilization differ in that they carry an X-chromosome, while sperm cells that give rise to male (XY) offspring carry a Y-chromosome.

Telomeres at the end of DNA prevent the chromosome from growing shorter during replications (with loss of genetic information) by employing " telomerases " to synthesize DNA at the chromosome terminal.