Sex determination Flashcards
1
Q
how many chromosomes do humans have?
A
46
2
Q
what number pair of chromosomes are the sex chromosomes?
A
23rd pair
3
Q
what is the makeup of chromosomes for a male?
A
XY
4
Q
what is the makeup of chromosomes for a female?
A
XX
5
Q
what happens when the male and female pair of chromosomes are split by meiosis?
A
-all eggs contain an X
-50% of sperm contain an X
-50% of sperm contain a Y
6
Q
does the sperm or the egg determine the gender?
A
sperm
7
Q
what is the SRY gene?
A
-the sex determining region
-SRY gene codes for male sex hormones called androgens
-the hormones cause testes to develop in an XY embryo
-absence of the gene results in ovaries developing
