As long as a female has mated with only one maleall her daughters share a complete set of chromosomes from that male. Individuals exhibiting these are called intersexes. This pair of chromosomes has a role in sex determination. Krebs and Stuart A.
The sex that can produce either X or Y chromosome containing gametes is called heterogametic. Males being the heterogametic sex does not occur in every mammal. Somatic sex: production of gonadal hormones continues to increase until at puberty when secondary sex characteristics appear.
At present, there are no known means of arresting this condition. In humans, one of the sexes is heterogametic i. Evolution of eusociality Presociality Social insects Gamergate Group selection Haplodiploidy Identity in social insects Kin recognition Kin selection Sexual selection in social insects Thelytoky Worker policing.
Drosophilia melanogaster Fruit flysome individuals are very large, exhibited a variety of morphological abnormalities, usually very sterile and expressed both male and female morphology. Sex-linked lethal by bring about death will alter the sex ratio in a progeny. The sex chromosomes X and Y often are of unequal size, shape and or staining qualities.
Sex Determination and Sex Chromosomes 1. Rosy Nayak. SlideShare Explore Search You. Like this presentation? You can change your ad preferences anytime. Save so as not to lose.
Social Research. These include amount and distribution of hair e. Somatic sex: production of gonadal hormones continues to increase until at puberty when secondary sex characteristics appear.