The developmental age of a growing person does not necessarily correspond to his or her chronological age. The two sexes differ considerably in their developmental tempo, and there are tempo differences also within the same sex. Early developers appear older, late developers appear younger than their chronological age might suggest. Based on a sample of German boys and girls of the same ethnicity, aged between 8 and 17 years sex differences of height, weight and secondary sexual characteristics are analyzed. Girls on average, develop faster than boys.
Secondary sex characteristic
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Swyer syndrome is a condition that affects sexual development. Sexual development is usually determined by an individual's chromosomes; however, in Swyer syndrome, sexual development does not match the affected individual's chromosomal makeup. People usually have 46 chromosomes in each cell. Two of the 46 chromosomes, known as X and Y, are called sex chromosomes because they help determine whether a person will develop male or female sex characteristics. Girls and women typically have two X chromosomes 46,XX karyotype , while boys and men usually have one X chromosome and one Y chromosome 46,XY karyotype. In Swyer syndrome, individuals with one X chromosome and one Y chromosome in each cell, the pattern typically found in boys and men, have female reproductive structures.
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Sexual characteristics are physical or behavioral traits of an organism typically of a sexually dimorphic organism which are indicative of its biological sex. These can include sex organs used for reproduction and secondary sex characteristics which distinguish the sexes of a species, but which are not directly part of the reproductive system. In humans, sex organs or primary sexual characteristics , which are those a person is born with, can be distinguished from secondary sex characteristics , which develop later in life, usually during puberty. Humans born with sex characteristics that are in any way from both columns are called intersex. In invertebrates and plants , hermaphrodites which have both male and female reproductive organs either at the same time or during their life cycle are common, and in many cases, the norm.
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. Secondary sexual characteristics emerge at puberty such as low voices and beards in human males, and high voices and no facial hair in human females. Primary and secondary sexual characteristics are physical traits that make males and females look and behave differently from each other in certain species, including humans. Secondary sexual characteristics appear during puberty.