Homozygous and weterozygous, Biology

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.

Posted Date: 12/11/2012 3:16:49 AM | Location : United States







Related Discussions:- Homozygous and weterozygous, Assignment Help, Ask Question on Homozygous and weterozygous, Get Answer, Expert's Help, Homozygous and weterozygous Discussions

Write discussion on Homozygous and weterozygous
Your posts are moderated
Related Questions
Name the subcellular particle where the electron transport chain is located. Mitochondria is  the subcellular particle where  the electron transport chain is located.

Q. What is the difference between type II diabetes mellitus and type I diabetes mellitus? Type I diabetes also known as insulin-dependent diabetes (as this name is not adequate

explain the respiration that takes place in different organisms??


Q. Are there differences between the male and female skeletons? Many general differences exist between female and male skeletons. Male skeleton is normally larger and heavier t


Define Sample Titration - estimation of vitamin c in chillies? Take a clean and dry large chilli and weigh it. Note the weight of the chilli. Grind the chilli to a fine paste i

Define Homogenization or Blending of Food Sample? Food homogenization - Liquid food samples are mixed manually before analyzing whereas solid foods are homogenized in a diluent

DE A T H - It is universal. It is last event in the degenerative process of ageing. It involves widspread cell break down & cell death. There is no heart beat, n

Q. Explain the Spring clip model? The spring clip model differs from the spring model in a way that the force applied is comparatively slower. This also depicts elasticity or p