Homozygous and weterozygous, Biology

Assignment Help:

Homozygous and Weterozygous

In an individual two identical alleles may exist [or a given character and, hence, the individual is referred to as Homozygous (e.g. AA and aa). If there are two non-identical or different alleles for a given character, the indivitlual is reffered to as heterozygous (e.g. Aa).

Let us examine a situation where both the parents arc homozygous. The male is homozygous recessive aa, and female is homozygous dominant AA. During nlciosis in the male the two 'a' alleles separate from each other so lhat cach spcrln has only a
single 'a' allele. Similarly, in the female parent each egg has one 'A' allelc. 'I'hc fertilisation of the 'A' egg by 'a' sperm results in n hcterozygoiis atiimal with 'Aa'. The form of gene which occurs in an individual in nalure is called the 'wild type' while a 'mutant type' is the one in which the genetic material is somcwhat altered. Mutants arise due to various reasons.

The alleles which express themselves in both honiozygous and heterozygous conditions are known as the dominant alleles. For example, 1T represents tallricss (homoqgous). The individuals having the alleles TT, and Tt would be tall as T is a dominant allele and it can express itself in both homozygous and heterozygous conditions. Some alleles express themselves only in hornozygous condition ant1 arc rcfcrrcd to as recessive alleles. In the height characteristic, dwarfness can be seen in individuals that have the alleles 'tt', i.e., recessive allelus are expresscti in homozygous condition only.


Related Discussions:- Homozygous and weterozygous

Taxonomy, what arachnid is beneficial

what arachnid is beneficial

Copulation, COPUL A TIO N - Followed with the help of penis. Sperms ...

COPUL A TIO N - Followed with the help of penis. Sperms are ejaculated deep in vagina. Polyestrous i.e. can capulate any time thorughout the year.

Define colorimetric method - 2, Define Colorimetric Method - 2, 4 Dinitroph...

Define Colorimetric Method - 2, 4 Dinitrophenylhydrazine Method? We shall use this method in estimating vitamin C in a given sample in the laboratory. Here, let us look at the

Life cycle of parasite - protozoan, Life cycle of Parasite - Protozoan ...

Life cycle of Parasite - Protozoan The life cycle of the parasite in man begins when an infected mosquito, while biting and taking a blood meal, injects sporozoites into the

Define seminal plasma in human male, Seminal plasma in human males is rich ...

Seminal plasma in human males is rich in : 1. fructose and calcium 2. glucose and calcium 3. DNA and testosterone 4. ribose and potassium Fructose and Calcium

What carbohydrate characteristic chemical features include, Carbohydrate ch...

Carbohydrate characteristic chemical features include: Select one: a. the potential to form multiple hydrogen bonds. b. the existence of one or more asymmetric centers.

What is the cellular structure to which mrna molecules bind, What is the ce...

What is the cellular structure to which mRNA molecules bind to start the protein synthesis? To make proteins mRNA molecules of necessity associate to ribosomes. Ribosomes have

Obelia, whyis it considered to showintermideate grade oforganisation

whyis it considered to showintermideate grade oforganisation

What are biopolymers, Q. What are biopolymers? Ans. Polymers are m...

Q. What are biopolymers? Ans. Polymers are macromolecules made by the union of several smaller identical molecules, called monomers. Biopolymers are polymers present in th

Calorie requirements for ulcerative colitis, Q. Calorie requirements for ul...

Q. Calorie requirements for ulcerative colitis? Energy: The calorie requirements must be increased to: 1) Restore weight status and maintain ideal weight. 2) Compensate f

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd