1) A. Regarding genetics, Who has an XY chromosome pair and who has an XX pair?
ID: 272870 • Letter: 1
Question
1) A. Regarding genetics, Who has an XY chromosome pair and who has an XX pair? B. What happens when a person does not have the normal number of sex chromosomes? C. Describe two examples D. Are the individuals typical male or female? A. What is so unique about the Y chromosome? B. what is the role of this region in terms of determination of a person's sex? 3) A. Does this region control the expression of various substances in the body? B. What substances? 4) A. What are the primary sexual characteristics of males and females? B. When do these primary characteristics typically develop? 5) A. Do the presence or absence of certain hormones during fetal development influence the appearance or absence of the above primary characteristics?Explanation / Answer
1. XY is a male
XX is female.
b , c & d
Turner syndrome occurs when females inherit only one X chromosome--their genotype is X0 (i.e., monosomy X). If they survive to birth, these girls have abnormal growth patterns. They are short in stature, averaging 4 foot 7 inches as adults, and often have distinctive webbed necks (i.e., extra folds of skin), small jaws, and high arched palates. They generally lack prominent female secondary sexual characteristics.
Triple-X syndrome occurs in women who inherit three X chromosomes--their genotype is XXX or more rarely XXXX or XXXXX. As adults, these "super-females" or "metafemales", as they are sometimes known, generally are an inch or so taller than average with unusually long legs and slender torsos but otherwise appear normal.
2. A.& B In mammals, the Y chromosome contains a gene, SRY, which triggers embryonic development as a male. The Y chromosomes of humans and other mammals also contain other genes needed for normal sperm production.
3. a& b
The Sex-determining Region Y (Sry in mammals but SRY in humans) is a gene found on Y chromosomes that leads to the development of male phenotypes, such as testes. The Sry gene, located on the short branch of the Y chromosome, initiates male embryonic development in the XY sex determination system.Testis-determining factor (TDF), also known as sex-determining region Y (SRY) protein, is a DNA-binding protein (also known as gene-regulatory protein/transcription factor) encoded by the SRY gene that is responsible for the initiation of male sex determination in humans.
4. Primary sexual characters in male and female are their reproductive organs.
They develop when organisms are in their fetal stage.
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