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
#question.why are active cells small .

Pullulan Pullulan is a water soluble edible microbial polysaccharide consisting of Maltotriose units (α 1 → 6), as shown in  the figure 2.12. It is produced by yeast  Aureobasi

L e p t o s p i r o s i s It is zoonotic disease characterized by interstitial nephritis, haemolytic anaemia and abortions. E t iology : The disease i

What are the economic importance of colenterata

M e t h ods of curing Curing ingredients are applied in dry form or as a solution of curing ingredients in water (pickle or brine). The combination cure is applied in the i

distribution of biodiversity

What is signifying by "gene locus"? The Gene locus (locus means place) is the location of a gene in a chromosome that is the position of the gene in a DNA molecule

Explain the Role in Insulin Formation? You are aware that insulin receptors are present in many cells with their concentration being highest in adipocytes (cells present in adi

Antibiotic resistance is the result of natural selection mutations, the only source of new genetic information available for bacteria. Rapid reproduction rates variation in bacteri

Question 1 State the basic properties of light. Discuss the special features of ultra-microscopy and phase contrast microscopy Question 2 What are ultrasonic waves.