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

What is the etiological agent, What is the etiological agent and the main m...

What is the etiological agent and the main manifestations of cholera? Cholera is a bacterial disease caused by the Vibrio cholerae. The disease is transmitted by fecal-oral rou

Secondary induction, Secondary Induction The two primary inductive ev...

Secondary Induction The two primary inductive events that we have described so far are significant in the patterning of early embryo. But there are another such signaling eve

How are antivenoms produced, Q. How are antivenoms produced? Why are antive...

Q. How are antivenoms produced? Why are antivenoms an example of passive immunization? Antivenoms are obtained by the following process: the venom (antigen) is inoculated into

Define citrate utilization test - imvic test, Define Citrate Utilization Te...

Define Citrate Utilization Test - imvic test? Several microorganisms have the ability to make use of citrate as the sole source of carbon and energy. This ability relies on the

What is thermoregulation in cold, What is Thermoregulation in Cold? Hea...

What is Thermoregulation in Cold? Heat production parallels the increase in O 2 uptake, the magnitude of which depends on the muscle mass .engaged in slivering or work and the

Explain factors that alter the speed of enzymatic recations, What are the m...

What are the main factors that alter the speed of enzymatic reactions? The major factors that change the speed of enzymatic reactions are temperature, pH and substrate concentr

1.notochord, general character and classification of platyhelminthes

general character and classification of platyhelminthes

Write in 3-4 lines about foot examination, Write in 3-4 lines about foot ex...

Write in 3-4 lines about foot examination Foot ulceration and amputation are common and major causes of morbidity and disability in people with diabetes. Skin integrity should

Homologous recombination, Homologous Recombination is the exchange of the ...

Homologous Recombination is the exchange of the sequence between two associated but different DNA (or RNA) molecules, with the result that a new "chimeric" molecule is obtained. S

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