Dictionary > Zygosity

Zygosity

Definition
noun
(genetics) The degree of similarity or the dissimilarity of the DNA sequences in specific coding segments, or genes, on the homologous chromosomes of a zygote, or fertilized egg
Supplement
Chromosomes that occur in two sets are referred to as diploid (2n). Humans and many other organisms are diploid. This means that their somatic cell would have two copies of chromosomes. This is because the first set of chromosomes came from the mother whereas the second set came from the father. In humans, there are 46 chromosomes, which means 23 of these are inherited from the mother and the other 23 chromosomes are from the father. Each one from the first set of chromosomes would have a matching chromosome on the second set based on the sameness of their loci. The two chromosomes that have matching loci are referred to as homologous chromosomes. Homologous chromosomes may have the same or matching loci but their alleles may be similar or different. The degree of similarity or the dissimilarity of the DNA sequences (alleles) between homologous chromosome is referred to as zygosity.
A cell or an individual may be classified based on zygosity:

See also:

Related term(s):

  • heterozygosity
  • homozygosity

You will also like...

Early Earth
The Origins of Life

This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..

dinosaurs
The Dinosaurs

Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..

Biological Cell Defense
Biological Cell Defense

Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..

Cambial cells
Plant Tissues

Plant organs are comprised of tissues working together for a common function. The different types of plant tissues are m..

Electromagnetic spectrum of a brain
Sleep and Dreams – Neurology

While learning and intelligence are associated with the functions of a conscious mind, sleep and dreams are activities o..

Biological Cell schematic diagram
Biological Cell Introduction

It only takes one biological cell to create an organism. A single cell is able to keep itself functional through its 'mi..

Related Articles...

No related articles found

See all Related Topics