Multiple Allelism

Multiple Alleles

As each gene may exist in alternative forms known as alleles, which code for different versions of a particular inherited character.

A part from that some genes may exist in three or more allelic which may be called as multiple alleles.

It is important to note that while multiple alleles occur and are maintained within a population, any individual possesses only two such alleles (at equivalent loci on homologous chromosomes).

Characteristics of Multiple allelism

A single gene has more than 2 alleles.
Only 1 allele of a particular gene occupied by a gamete or a chromosome.
Various alleles of the same gene express different alternative of same trait.
Multiple alleles in a homologous chromosome occupy the similar locus.

Examples of Multiple Allelism

ABO Blood group in Humans.
Skin Colour.
Eye colour in Drosophila.
Coat colour in Rabbit.

Comments

Allele definition biology || NEET | AIIMS ||

Alleles Each gene may exist in alternative forms known as alleles, which code for different versions of a particular inherited character. We may also define alleles as genes occupying corresponding positions on homologous chromosomes and controlling the same characteristic (e.g. height of plant) but producing different effects (tall or short). The term homologous refers to chromosomes that carry the same set of genes in the same sequence, although they may not necessarily carry identical alleles of each gene. Wild-type Alleles Normal or Prevalent alleles in a population are called wild-type alleles. These alleles typically encode proteins that are made in the right amount and function normally. Mutant Alleles Alleles that are present at less than 1% in the population and have been altered by mutation are called mutant alleles . Such alleles usually result in a reduction in the amount or function of the wil

Aristotle Lantern in Echinoderms

What Is Aristotle's Lantern? Our seas are filled with popular creatures – as well as those that are lesser known. This includes creatures and their unique body parts. One of them that has a unique body part and name are sea urchins. The term Aristotle's lantern refers to the mouth of sea urchins. Some people say, however, that it does not solely refer to the mouth alone, but the entire animal. Where Did the Name Aristotle's Lantern Come From? It's a funky name for a marine creature body part. This structure was named for Aristotle, a Greek philosopher, scientist and teacher who described the structure in his book Historia Animalium, or The History of Animals. In this book, he referred to the "mouth-apparatus" of the urchin as looking like a "horn lantern." Horn lanterns at the time were five-sided lanterns made up of panes of thin pieces of horn. Horn lantern The horn was thin enough for light to shine out, but strong

Water Vascular or Ambulacral System of Star Fish ; Asterias

how start fishes moves without fins?????? let see how ⇊⇊⇊ Water Vascular or Ambulacral System Water Vascular System is a unique feature of of all the echinoderms which helps mainly in locomotion . This it is the modified part of the coelom and consists of a system canals which is filled with sea water, containing amoeboid corpuscle s . It plays a vital role in the· locomotion of the animal and obtaining food is the major function of water Vascular system. The water vascular system of starfish consists of 1. madreporite, 2. stone canal , 3. ring canal, 4. radial canal, 5. Tiedemann’s bodies, 6. polian vesicles, 7. lateral canals and 8. tube feet. 1. Madreporite The water vascular system of star fish starts from the madreporite , which is rounded and hard due to calcareous plate on the aboral surfa

Basics of Biology

Search This Blog