gender - chromosomes Flashcards
how many chromosomes are there in a human being
46 in human body arranged into 23 pairs
the 23rd pair determines the biological sex.
what are chromosomes made of
made from DNA (deoxyribonucleic acid)
genes r short sections of DNA that determine the characteristics of a living thing.
what’s the chromosome structure for a female
XX
chromosome structure of male
XY
what chromosomes do egg cells carry
all normal egg cells produced by a human ovary have an X chromosome.
what chromosomes do sperm cells carry
half X
half Y
the babies sex is determined by the chromosome carried by the sperm.
what does SRY mean
the Y chromosme carries gene called sex-determinig region Y = SRY
what does SRY cause to develop
testes in a XY embryo.
these produce Androgens: male sex hormones.
what do androgens cause
cause the embryo to become a male.
without them the embryo develops into female.
all of above is the role of chromosomes
what’s the role of hormones in the womb
prenatally in the womb, hormones act upon the brain and development n cause development of the reproductive organs.
whats the role of hormones during puberty
during adolescence a burst of hormonal activity triggers the development of secondary sexual characteristics like pubic hair.
males n females have the same hormones but in different concentration.
what do men develop more than women that’s importance
(role of hormones)
primary importance male development is number of hormones androgens = testosterone
what does testorone control in men
Testerone controls the development of male sex organs
when is testorone produced in men
develops at around 8 weeks of foetal development