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

Implementation of nursing care plan, Implementation The planned goals ...

Implementation The planned goals and strategies are translated into nursing intervention by means of the nursing care plan. It is essential that the client and family par

Locate the position of the submerged implants, Locate the position of the s...

Locate the position of the submerged implants. It can be located by the following means: - correlating the radiographs with intraoral position - on slight palpation of  soft

Intravenous route, Intravenous Route This route of administering drug...

Intravenous Route This route of administering drugs is becoming more popular in the paediatric practice. Purpose of this Route When rapid action is required.

Define the role of riboflavin in antioxidant activity, Define the role of r...

Define the role of riboflavin in Antioxidant Activity? Flavoproteins also have powerful antioxidant activity from their role as precursors to FMN and FAD. Among the FAD-requiri

Define the figure of 8 and mattress suturing techniques, Define The figure ...

Define The figure of 8 and Mattress suturing techniques The figure of 8:  is placed similarly to the simple loop on the buccal aspect; however, on the lingual aspect, the needl

Evolution/genetics, Why do biologists believe humans, chimpanzees, and gori...

Why do biologists believe humans, chimpanzees, and gorillas all came from an ancient ancestor

Define chlorophyll, Chlorophyll Chlorophyll, the pigment responsible fo...

Chlorophyll Chlorophyll, the pigment responsible for giving bright green colour to the vegetables, is very unstable and undergoes changes in colour which are often considered t

Define the major events of the second mitotic period, Q. What are the major...

Q. What are the major events of the second mitotic period? The second mitotic period is the metaphase. In metaphase the following events occur condensed chromosomes bind in the

What do you understand by coelenteron, What do you understand by Coelentero...

What do you understand by Coelenteron? The name given to internal cavity of the cnidarians. This is an incomplete gut with just one opening, the mouth. Food to be digested and

Suger diabetes, what normally cause type one sugar diabetes

what normally cause type one sugar diabetes

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