Name
Date
Period
Student Note Guide
I. Sex Determination in _________________
A. General Information
1._________ chromosomes come from Mom
2.__________ chromosomes come from Dad
3. 23rd pair of chrs. Is______________________
4. 23rd pair of chrs. Is ______________________
★Total # of chrs. In normal human = _________________
Autosomes = _______________________
Sex Chromosomes = _________________
B. Details of Sex determination
1. Having a Y chr. _____________________
2. Absence ____________________________
3. ♂s make ______________________
4. If_________ sperm fertilizes egg, then _________child
5. If _________sperm fertilizes egg, then _________ child
Draw the diagram Here
★Therefore________________ determines the sex of the child
II. Pedigrees
A. = diagram showing the inheritance of a certain gene through several generations
B. Symbols
♀ = _______________
Draw the diagram Here
♂ = ________________
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III. ___________________________
A. Usually found on _____________________
B. Affects _____________more than ____________________
C. Females can be_____________________, & not have the disorder (but
can_______________________)
D. Examples: ______________________and _____________________________
IV. Hemophilia
A. Background Facts
1. ____________________________
2. Caused by ________________________
3. Slight ______________________________can be fatal
4. __________________________sex-linked genetic disease
5. Info. on _______________chromosome (no info.________________)
V. History of Hemophilia
One of Victoria’s Secrets…
A. Queen Victoria of England was a ________________________________
B. Queen Victoria’s descendants
C.________________________________, son of Tsar Nicolas II
One of the most famous hemophiliacs was Russian Prince Tsarevitch Alexei, killed along with all
his family during the_____________________________________
.
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VI. Treatment of Hemophilia
A. _________________________________________
B. Danger:
VII. Hemophilia problem
• Alice is a ____________________________
• Her ____________________does not have the disorder.
• Can their children have the disorder?
•
Let’s use a ___________________ square to determine the probabilities.
Xh =______________ X = ______________ Y = ____
Draw Punnett Here
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