Sex-limited traits, Biology

Assignment Help:

Sex-Limited Traits

Sex Limited Traits are traits expressed only in one sex, although the genes controlling thcm arc prcscnt as wcll as transmitted to both thc sexes. Therefore, males and femalcs with thc bamc genotype, with rcspcct to a particular locus may have different phenotypes.

Sex-Limited Traits arc determined by autosomal genes, whose phenotypic expression is determined by the presence or absence of one of the sex hormones. Since sex hormones are the limiting factors, rhc phenotypic expression of these genes is limited to onc sex or the other. The most obvious exanlples are the secondary sex characteristics. Beard development in human beings is one such sex-limited character as men have beards, and woman normally do not. Yet studies indicate no significant differences between thc sexes in number of hairs per unit area of skin surface except in their development. This appears to clepend on sex hornlone production. Any disturbance in these hol-rnones in women rnay result in the development of beard. Similarly, the full development of breasts in females, and presencc of prostate glands in males are thc examples of sex-limited traits seen in human beings. Traits like egg laying in chickens, oviposition behaviour in insects are somc other such examples. Milk production in mammals is limited to females, but certain bulls are in great demand among dairy breeders and artificial inscinination associations because their mothers and daughters have incresed milk production records.


Related Discussions:- Sex-limited traits

Can the heat capacity of water be considered small or large, Can the heat c...

Can the heat capacity of water be considered small or large? What is the biological significance of that characteristic? From thermology it is called that the quantity of exch

What would happen to the neuron, If neurons are exposed to a chemical agent...

If neurons are exposed to a chemical agent that prevents the NA+ channels from opening, what would happen to the neuron? What would happen if the K+ channels were inhibited? What d

Explain about the stilbenes, Explain about the Stilbenes? Stilbenes con...

Explain about the Stilbenes? Stilbenes contain 3 phenyl compounds connected by a 2-carbon methylene bridge and occur in nature in restricted distribution. In plants, they act a

What is the concept of lophophore, What is the concept of Lophophore? A...

What is the concept of Lophophore? A unique double ring of hollow ciliated tentacles that surround the oral opening in some animal phyla. There is some debate as to whether the

Describe surgical treatment prosthetic valve endocarditis, Describe Surgica...

Describe Surgical Treatment prosthetic valve endocarditis ? If there is definite indication for early surgery, the current understanding is to proceed with valve replacement ir

Haccp control point, HACCP Control Point  HACCP Control Point :  Any...

HACCP Control Point  HACCP Control Point :  Any step at which biological, chemical or physical factors can be controlled.

Formation of female gametes, Formation of female gametes: Ovule deve...

Formation of female gametes: Ovule develops from a cushion like part of the ovary called the PLACENTA. Ovule is connected to the placenta by a stalk known as FUNICLE. The

Show the types of oesophagitis conditions, Q. Show the types of oesophagiti...

Q. Show the types of oesophagitis conditions? The two types of oesophagitis conditions: 1. Acute Oesophagitis - It is characterized by substantial pain on swallowing. It is

Chances of a kidney graft being rejected, State two procedures which are us...

State two procedures which are used to reduce the chances of a kidney graft being rejected Drugs are used to suppress the patient's immune response to foreign tissue. The dono

Describe Fatty acids, In chemistry and particularly in biochemistry the fat...

In chemistry and particularly in biochemistry the fatty acid is a carboxylic acid with a long aliphatic tail (chain) that is either saturated / unsaturated. Many obviously occurrin

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