340 results found

Search Results for: x chromosome

X chromosome

Definition noun, plural: X chromosomes A mammalian sex chromosome which typically occurs in two in females and one in... Read More

Chromosome

Chromosomes Definition Chromosomes are the thread-like structure present in the nucleus of plant and animal cells.... Read More

Sex chromosome

Definition noun, plural: sex chromosomes A type of chromosome in the genome that is involved in the determination of the sex... Read More

Men could go extinct? Y chromosome disappearing slowly

Hold on to your seats, gentlemen -- the male chromosome (Y chromosome) disappearing at a certain rate could absolutely be... Read More

Gamete

Definition of Gamete What is a gamete? A gamete is the mature reproductive or sex cell that contains a haploid number of... Read More

Chromosomes X and Y and Sex Determination

Reviewed by: Mary Anne Clark, Ph.D. In humans, the normal chromosome complement is 46, consisting of 22 pairs of... Read More

Chromosomal mutation

Every living thing is made up of DNA. Our DNA is what makes us unique and different in the world. Our DNA is made up of... Read More

Y chromosome

Definition noun, plural: Y chromosomes The male-determining sex chromosome particularly in humans and other... Read More

Submetacentric chromosome

Definition noun, plural: submetacentric chromosomes A chromosome with a centromere located sub-median resulting in slightly... Read More

Homologous chromosome

A homologous chromosome pertains to one of a pair of chromosomes with the same gene sequence, loci, chromosomal length, and... Read More

Triple-X syndrome

Definition noun A genetic condition in which a female has an extra X chromosome Supplement In humans, the sex chromosomes... Read More

Y linkage

Definition noun, plural: Y linkages (genetics) A form of sex linkage involving particularly the Y chromosome Supplement Sex... Read More

X linkage

Definition noun, plural: X linkages (genetics) A form of sex linkage involving particularly the X chromosome Supplement The... Read More

Chromosome Mutations

Reviewed by: Mary Anne Clark, Ph.D. By nature, the genetic information from both parents is expected to be seen... Read More

Chromatin

Chromatin Definition What is chromatin in a cell? Chromatin is a complex of nucleic acids (e.g. DNA or RNA) and proteins... Read More

Trisomy

Definition noun, plural: trisomies (genetics) A type of aneuploidy characterized by the gain of an extra copy of a... Read More

X-linked

Definition adjective (genetics) That which is associated with the X chromosome Supplement The term X-linked is defined as... Read More

Sex-linked trait

Definition noun, plural: sex-linked traits A trait genetically determined by an allele located on the sex... Read More

Sex-determining Region Y gene

Definition noun The gene that codes for the SRY protein, which is associated with the testicular development in many male... Read More

Klinefelter syndrome

Definition noun A genetic condition in a male characterized by the presence of at least one extra X chromosome Supplement In... Read More

Y-linked inheritance

Definition noun (genetics) Inheritance for genes on the Y chromosome Supplement Sex chromosomes are not only relevant... Read More

Sex-linked gene

Definition noun, plural: sex-linked genes A gene located in the sex chromosome. Supplement In humans, the sex... Read More

Sex-linked disorder

Definition noun, plural: sex-linked disorders A genetic disorder caused by or linked to gene(s) located in the sex... Read More

X-linked inheritance

Definition noun (genetics) Inheritance for genes on the X chromosome Supplement Sex chromosomes are not only relevant for... Read More

Genome

Genome Definition What is a genome? As defined in biology, a genome is a complete set of deoxyribonucleic acid (DNA) within... Read More

Diploid

Diploid Definition Let's first understand the meaning of the word - diploid. From the words ‘di’, meaning "two", and... Read More

Mosaicism

Cells often go through many divisions before they become a part of an organism’s genetic make-up. This leaves room for... Read More

Meiosis

What is Meiosis? A simple definition of meiosis would be is this: meiosis is the process of cell division that results in... Read More

Monosomy

Definition noun (genetics) A type of aneuploidy characterized by the loss of a single chromosome of the normal... Read More

Sex linkage

Definition noun, plural: sex linkages A condition in which a trait or a phenotype manifesting apparently more frequently in... Read More

Autosome

Definition noun, plural: autosomes (genetics) Any chromosome not considered as a sex chromosome, or is not involved in sex... Read More

Sex Reversal – When Males Grew Ovaries Instead of Testes

Summary: Sex reversal is not unusual in some animals, especially in invertebrates. As for the vertebrates, there are... Read More

Metacentric chromosome

Definition noun, plural: metacentric chromosomes A chromosome in which the centromere is located in the middle resulting in... Read More

Acrocentric chromosome

Definition noun, plural: acrocentric chromosomes A chromosome whose centromere is subterminal resulting in its q arms being... Read More

Subtelocentric chromosome

Definition noun, plural: subtelocentric chromosomes A chromosome whose centromere is placed near the end rather than the... Read More

Chromosome 2

Definition noun In humans, the autosome that is considered as the second-largest, spanning more than 242 million base pairs,... Read More

Bivalent

Bivalent Definition What is bivalent? In genetics, bivalent is used in describing homologous chromosomes (referred to as... Read More

Meiosis and Alternation of Generations

Review of Mitosis: Cell Cycle The cell cycle contains the process in which cells are either dividing or in between... Read More

Quinacrine banding

Definition noun (cytogenetics) A chromosome banding method that treats chromosomes with quinacrine dihydrochloride to reveal... Read More

Patau syndrome

Definition noun A genetic disorder caused by genetic changes in chromosome 13, such as an extra copy of chromosome 13... Read More