Sex-limited traits, Biology

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.

Posted Date: 12/11/2012 4:49:16 AM | Location : United States







Related Discussions:- Sex-limited traits, Assignment Help, Ask Question on Sex-limited traits, Get Answer, Expert's Help, Sex-limited traits Discussions

Write discussion on Sex-limited traits
Your posts are moderated
Related Questions
Cyanotic Heart Disease In  this there is a communication between Pulmonary and systemic circulation through which venous blood enters the systemic circulatory system. The infa

Vascular Cambium The vascular cambium usually, if not always, has a dual origin within the primary tissues; from provascular strands, and from the "ground" meristem tissues be

what is the mode of nutrition in pisces

When the chromosomes  are depleted  of histones  they  are seem  to have  a central fibrous 'protein  scaffold'  or nuclear  matrix  to which the DNA is attached  in loops. Therefo

What might be the value of the Everglade restoration plan? Everglades will protect endangered species, such as the Florida panther, and restore the water flow needed by many or

PRODUCT S OF HEMP PLANT - Four drugs - bhang, ganja, charas & marijuana obtained from Cannabis indica and C. sativa of family Moraceae . Main alkaloid is tetrah

Explain about the Osteomalacia - Deficiency of Vitamin D? It occurs when there is a lack of vitamin D and calcium, in women who have had many pregnancies, who subsist on a meag

S n ake bite Biting by a poisonous snake is manifested by clinical findings of local swelling and nervous symptoms. E t iology: The poisonous snakes have different typ

While discussing the Darwinian premise of natural selection we observed that the term selection is synonymous with non-random reproduction, and that the success of the survivors is

Littoral and Benthic Zone Littoral Zone This is the shallow water zone, near the shore, where light penetrates to the bottom. Rooted plants can grow only in this region.