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Class _________ Date _____ _
_;.HAPTER --------=::::=------------^ 11 "--./ S K IL L A C TI V I T Y-
{n .uman l-feredicy lnterpreting diagrams
Sect,on 11-
Applied Genetics
A. Duchenne muscular dystrophy is a deadly disorder in which the muscles grow progressive!)· weaker. The disease is caused by a recessive gene on the X chromosome. The pedigree chart below illustrates the inheritance ol this gene. Use the chart to answer the questions that lollow.
Key:
o
Normai Iemale
□
Normai male
o
Carrier female
Female with
il J (^) ■
Male wi1h disorder
I. 1s Duchenne muscular dystrophy more likely lo occur in males or in females? Explain your answer.
---,--,� o,_-...^ },, "" eo' \ 1 � Ì\....._ --- :, D>-"--"vdì.0,)v,JL I X
CJ'JcJ-o-,<..L:-'f'l»: -\h:x:t r,5i,,-;,cl�_ \ç'.h,, ,.�; �,,.o O.....u__g_
2. Individuai H is a Iemale with this disorder. Explain how she inherited this disease. n::H�_
" r �� h. , r \ \t ,..., ''°""'--' ,_h.;-Y
3. lndhidual K has this disorder, yel his father did not. Explain how this is genelically possible.___
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4. Individuai G does noi have the disease. yet his mother was a carrier and his father had the disease.
Explain how this is possible. '(t'<-1 :d,. ,, e\ ..1...f"' � lie:\ ..Ì',..l \ e� fl.j I iOSt- l�'-':
'-L .1.Yr \· ·v) 'Ì.etd o..i-.c\ :..\...e 'f.-. 1.,"".«-x,,,, �\ · r-\ \� o_.i..l.. '-"---t;'\J...,·,,,Y\ "--\>..,� '--'f)�YY..,
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' v (^) l 03:, ah Cl� B. Huntington diskse, a disease o! the nervous system, is caused by an autosomal dominant gene. The pedigree chart below illustrates a lamily with individuals who ha,·e Huntington disease. Use the chart to answer the questions that follow.
Key:
o
Female
e
�
�
H I (^) □ Male hh
I �
H Huntington <fisease
® @ c5 �
h Normai gene
� �
,. I IL ,, I^ 'ìJ'
6. What is the probable genotype o! individua] O? Explain your answer.^ ....t:trl^ 'C..):i.Cc '-i.... L
<s\ .J "ù__ , .._ ... • -1.. -6 \ � � '" è. §o t. o.. "b" �\UA.^ *l'Y\QV*
7. What are the �obable genotypes of indi�iduals H and I? Explain your answer. :-1, ,�,., �-\t
ç·�r( f I^ .J^ a.�+-^ i ^ 1-^ ù.)^ (Y,6""lì^ (:^ e�'----^ +-^ h- SCh'-J ( (^) " � (^) "' c.:"
8. What is the probability that N wìll oot haYe Huntington disease? ___ ç,._»:>�-"------- 9. Which individuals can be determined to bave Huotington disease? f), tj, (""'I .
� -^ "-,^ L, ,:)
IO. ldentily the individuals whose genotypes cannot be determined without more information. f, <l 1 f'h,f-.Jl.L
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Name ------- - ----,-------
' �
Class _____ Date ______
Figure 3
� r� -
':"' -. -- �I ... .,-^ I._,.^ ,,... - .;r
Tongue roller (^) Non-to,gue roller
3. U you cannot roll your tongue, enter the genotype rr io the space below your symbol on the pedigree.
4. U you can roll your tongue, enter the genotype R _ lor the presence ol the dominant gene ln
the space below your symbol on the pedigree.
5. U you are constructing a pedigree lor your own lamìly, survey additiooal members of your
lamily lor their ability to roll their tongue. lf you are constructiog a pedigree lor another family, survey as many members ol that family as possible.
6. Record the results of family members you tested in your pedigree.
Observalions
I. What is the genotype o! 1-2? E.xplain your answer. (^) �E,-......e=
,dl"ìffi.i ,'\Q^ +^1 \O,:x
s�� c:ih.-�d
2. What are the genotypes of 11-1, U-2. 11-3, and^ U4?^ Explain your answer.
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G.9.S IDA>A ar-:-m\ '\C\f\J: ±l..0,1.l ,
ì
Name----------:- �
-ff---
Analysis and Conclusions
Class _____ Date ______
I. Would you e.'<pect the other students in your ciass to have tongue-rolllng pedigrees that are
identica! [O^ yours? Explam your answer. ...1'-..JG-===----"-,^ r _, A ....._. c __, c ......_ (' **,** 13...:• .:... :Ì ..:.....,a ..x__=---- ---=-'-J " 1;1Ì'"\ (^) V-J-..M "-. o,2;;:r-l.^ "^ 1 0-n1n d\ LQ I <..J/ iliu, 1
- Explain why you are not always able to determine the exact genotype for a trait of a person
whea you construct a pedigree. Q Q QTT\lf\0.,,()-- §C..., T C'0-•1ì
� " 'J �1_.,C,1.._1..1..S, G, r ùh Ou1..L "' , O.rì I f' th.L1..!/ Jvv ..,^ (:i 0...f D �-:1- C'r,lic:L'-LQ -...:,I (fCE'§11..'::::'<-- j::{0,;-�. _\u.A e et. � l'.k-_^ �^
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- U two pa,-ents are unable to roll their toagues, is it likely lhat they will have childrea who will
be able to roll their tongues? Explain yaur aaswer. h,io ' Qc,n- 'o I\Qs
,t) , \.iu'�^ '::)$, 1., r^ E::iO^ soc..n^ -J'°:'io. l..S;_ f.{.
Criticai Thinking and Application
I. Can the actual tralts of an offspring be determined by kno.,.ing the traits o! the pareats?
E.,qilain your answer. t---.x: -' , !ne ::\e.r Òbvcx-ì.....s rnre rcts _,; .J p=
5...1: QQ,. 1'vàt. Cl..>-. u....,OJ......,o � f)'.:.Q
�, '1-R c. SO% e bo.x\u, .� pa.ssi n;t_ OYì
. (^) J if Jf. 'ti fx(.o,çtl: :;) f e.e�, ùl::. (^) \00{ e.rtl:s ...s, � oc .__ a..+ J..:
)e\
Ao-.'iò\J:,c. 2. A woman received the genes aBcD !rom her mother aad AbCd !rom her lather. Which o! the
J
lollowing gene combinations could be present in her garnetes: ABCD, abcd, � �. ABcd, � Explain your answer. ____________________
A&:D.� o.bcd (^) l AP:ie:d. (^) J &f'C^ "� ,co.,, OTÙ.>-•, -...hcu.,'-t. J i o,S.d4 -G12.. >Cio.cb :ko,,�.
- Il a man who has !ong eyelashes (U.) marries a woman who has Iong eyelashes (LI). what are
the posslb!e genotypes and phenorypes o! their children•^ -'"OJ-='""�""---"l.,,mJOc"'-'--"-"�----
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