Bio Lecture 18

Front 1

__________ is defined as using the biological traits of an organism; the ________ of these traits results in a female or male organism.

Back 1

sex, sum

Front 2

The male sex hormone is _______________, which is produced by the ________________ and the ___________.

Back 2

testosterone; testes; adrenal glands

Front 3

All _________ have the potential to become either male or female because they both have the same chromosomes except for the sex chromosomes.

Back 3

embryos

Front 4

At __________ after fertilization an embryo will receive cues that will determine if it will develop as either male or female

Back 4

6 weeks

Front 5

Under the influence of estrogen, the ____________ ducts will begin to transform into internal female ___________

Back 5

Mullerian; genitalia

Front 6

In male embryos the ____________ gene on the Y chromosome becomes active at around 6 weeks after fertilization.

Back 6

SRY

Front 7

In males, testosterone stimulates the development of the ___________ ducts into internal genitalia, while the ___________ develops into external the genitalia

Back 7

Wolffian; cloaca

Front 8

Although, the SRY gene acts as a ________________, there are about ________________ genes implicated in sexual development.

Back 8

master switch; 10-12

Front 9

Estrogens and testosterone belong to a group of hormones called ____________, and both originate from the same precursor, ________________.

Back 9

steroid hormones; cholesterol

Front 10

______________ occurs in 1:1,000 male births and the characteristics of this syndrome are infertility, abnormal secondary sex characteristics, and long limb physique.

Back 10

Kleinfelter syndrome

Front 11

_________________ or super male syndrome occurs in 1 out of every 850 male births and the male will exhibit _____________ secondary sex characteristics and will be _____________.

Back 11

XXY; normal; fertile

Front 12

In crocodiles _____________ determines the sex of the offspring

Back 12

temperature