bio lecture 18
Terms
undefined, object
copy deck
- __________ is defined as using the biological traits of an organism; the ________ of these traits results in a female or male organism.
- sex, sum
- The male sex hormone is _______________, which is produced by the ________________ and the ___________.
- testosterone; testes; adrenal glands
- All _________ have the potential to become either male or female because they both have the same chromosomes except for the sex chromosomes.
- embryos
- At __________ after fertilization an embryo will receive cues that will determine if it will develop as either male or female
- 6 weeks
- Under the influence of estrogen, the ____________ ducts will begin to transform into internal female ___________
- Mullerian; genitalia
- In male embryos the ____________ gene on the Y chromosome becomes active at around 6 weeks after fertilization.
- SRY
- In males, testosterone stimulates the development of the ___________ ducts into internal genitalia, while the ___________ develops into external the genitalia
- Wolffian; cloaca
- Although, the SRY gene acts as a ________________, there are about ________________ genes implicated in sexual development.
- master switch; 10-12
- Estrogens and testosterone belong to a group of hormones called ____________, and both originate from the same precursor, ________________.
- steroid hormones; cholesterol
- ______________ occurs in 1:1,000 male births and the characteristics of this syndrome are infertility, abnormal secondary sex characteristics, and long limb physique.
- Kleinfelter syndrome
- _________________ or super male syndrome occurs in 1 out of every 850 male births and the male will exhibit _____________ secondary sex characteristics and will be _____________.
- XXY; normal; fertile
- In crocodiles _____________ determines the sex of the offspring
- temperature