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

Calcium control of glycogen metabolism, As we have seen, in during epinephr...

As we have seen, in during epinephrine hormonal control or glucagon, dephosphorylated   phosphorylase   kinase   is activated by being phosphorylated by protein kinase. This then a

Growth regulators, Growth Regulators Besides the major five hormones, ...

Growth Regulators Besides the major five hormones, polyamines can also exert regulatory control over growth and development at micromolar concentrations. They are widespread a

Water absorption and transpiration, Water Absorption and Transpiration ...

Water Absorption and Transpiration The rate of water absorption is controlled by the rate of transpiration. A high water potential in the atmosphere would reduce water loss fr

Chronic mitral regurgitation-indications for surgery, Chronic Mitral Regurg...

Chronic Mitral Regurgitation :  In chronic mitral regurgitation, the asymptomatic phase is much longer than in mitral stenosis. Onset of symptoms may also mean the onset of l

Determine the viscosity of solutions, Viscosity Viscosity, as you may ...

Viscosity Viscosity, as you may already know, is associated with fluid flow.  It is the internal friction which tends to bring to rest portions of the fluids moving relative to

Determine in brief about the classic migraine, Determine in brief about the...

Determine in brief about the Classic migraine This is probably the most interesting form, occurring in about 12% of migraine sufferers, because it begins with an aura, which us

Lungs, what is the lungs structure in relation to the excretory system?

what is the lungs structure in relation to the excretory system?

Can you explain anticodon, Q. How are amino acids brought to the cellular s...

Q. How are amino acids brought to the cellular site where translation takes place? What is an anticodon? Amino acids are brought to ribosomes by RNA molecules known as transfer

Describe nerve cells, In eukaryotes possibly the most rapid and complex sig...

In eukaryotes possibly the most rapid and complex signaling is mediated through nerve impulses.  The Nerve  cells  (neurons)  consist  of  a cell  body  with  numerous projections

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