Primary and secondary sexual characteristics refer to specific physical traits that set apart males and females in sexually dimorphic species that is, species in which the males and females look different from each other. Primary sexual characteristics are there from birth (for example, penises vs.). While primary sex characteristics are those that are present at birth, secondary sex characteristics are those that appear during puberty. These secondary sex characteristics are caused by hormones released at the time of puberty, which usually is around two years earlier in girls than in boys. Secondary sex characteristics secondary traits that appear at puberty differently for males and females learning outcomes as you complete the lesson, you should be able to. Male secondary sexual characteristics are the things that change in males during puberty. A number of secondary sex characteristics are gender-specific and provide excellent hormone-dependent response indices. Plumage differs in males and females these sexual dimorphisms first appear as early as three weeks of age. Why do secondary sex characteristics in males and females occur? We need you to answer this question! If you know the answer to this question, please register to join our limited beta program and. Especially during adolescence, development is at a faster rate. For the purpose of reproduction, there are some different characteristics which can be observed in boys and girls. Although there is a considerable difference between primary and secondary sexual characteristics, many would not have thought about that. In a very brief statement, primary characters are the sexual organs, but secondary characteristics are the sexual hormones and other related functions. Secondary sex characteristics are physical changes that develop during puberty, but not directly involved in reproduction. Two for girls are the development of the breasts and the widening of the hips. In men, it is that the shoulders broaden and hair appears on the face and chest.