What is a single arm chromosome?
Isochromosomes are chromosomes composed of mirror images of one of the arms of the chromosome. As a result, the opposite chromosome arm may be deleted and the cells only have a single copy of the genetic material in the arm present in the normal member of the homologous pair.
What is a single chromosome called?
A chromatid (Greek khrōmat- ‘color’ + -id) is one half of a duplicated chromosome. Before replication, one chromosome is composed of one DNA molecule.
What is Q arm?
q arm of a chromosome: The long arm of a chromosome. … Origin of p and q as chromosome arms: The symbol “p” was chosen to designate the short arm because “p” stands for “petit”, “small” in French. The letter “q” was selected to signify the long arm merely because “q” is the next letter in the alphabet.
What is meant by an allele?
An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. … Genotypes are described as homozygous if there are two identical alleles at a particular locus and as heterozygous if the two alleles differ.
What does a centrosome look like?
Centrosomes are made up of two, barrel-shaped clusters of microtubules called “centrioles” and a complex of proteins that help additional microtubules to form. This complex is also known as the microtubule-organizing center (MTOC), since it helps organize the spindle fibers during mitosis.
What do you mean by Telocentric?
: having the centromere terminally situated so that there is only one chromosomal arm a telocentric chromosome.
What does Cri du Chat mean?
Cri du chat syndrome is a rare genetic disorder caused by missing pieces on a particular chromosome. It is not the result of anything the parents have done or failed to do. The characteristics of a newborn with cri du chat syndrome include a high-pitched cry, a small head and a flattened bridge of the nose.