In the Genes or in the Jeans

16.5 Case Study

Gender: In the Genes or in the Jeans?

Directions: Go to this website: http://www.sciencecases.org

Complete Parts I and IV-B only

1. What are the biological differences between males and females? Brainstorm and come up with as many differences as you can.

|Males |Females |

|External sexual reproductive organs: penis and testicles. |Internal sexual reproductive organs: uterus, fallopian tubes, |

|Sex gamete: sperm |ovaries, etc. |

|Endocrine system: produces hormones such as testosterone. Male |Sex gamete: ovum/egg |

|hormones are called androgens. |Endocrine system: produces hormones such as estrogen and |

|Have a larger brain (by 2%). |progesterone. |

|Skeletal system: men have a larger bone structure that can support|Have a larger corpus callosum, which transmits information between|

|more muscle. Have a larger cranium to support their bigger brains.|the right and left hemispheres. |

| |Skeletal system: women have an angled pelvis to aid in childbirth,|

| |have more narrow ribcages, and have less angular facial features. |

2. When faced with a large number of things, scientists often find it useful to group them into a smaller number of categories. After you have completed your list, divide your characteristics into categories.

|Category |Males |Females...