DrVirgo
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See picture...
Choices:
A. 100
B. 50
C. 33
D. 25
E. 0
(%)
PLEASE EXPLAIN!! 
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| muzammil
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wher is the pic
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| DrVirgo
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.here is the pic... sorry it didn't attach first time. 
Attached Files:
Genetics.JPG (42 KB, 160 downloads)
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| robin082006
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A. 100%
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| DrVirgo
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no. not A
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| robin082006
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E???????
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| Cedrick
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D
if is ressesive 25%
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| Cedrick
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If is autosomic DOMINANT is 50%
if is autosimic Ressesive is 25 %
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| DrVirgo
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E is right... can you explain Robin?
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| Cedrick
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yes please
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| Cedrick
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It does not matter to me
thanks for the post
gang
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| robin082006
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look III3 and III4
Both are males and receive X chromosome from their mother.
Both are phenotypically normal so their X chromosome is normal--> upper X chromosomes is normal.
II4 is father, has one X normal.
III 2 recieves one normal X from father and the normal other from mother. she carries both normal X--> 0%
at first I only looked at father and though lower X is noraml and the upper one is abnormal. I should be careful for such question
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| Cedrick
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tricky one
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| DrVirgo
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Thanks... I figured it out by the pedigree only... You don't need the info withthe bands to solve it, right?
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| study_ing
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U do...to figure out that the alleles in the 2 normal sons are differentand hence BOTH are normal. if the bands werent there , we'd have to calculate risk of being a carrier etc
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| DrVirgo
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yes i see it now... II-5 has two normal X's so her kids are normal.
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| mediocre
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hello, I am finding it tough to understand the qs especially the box with dashes and roman numerals,forgive me for sounding like a lay man ,I think step1 will force me to come face to face with all the nightmares i avoided back in medical school......gulp!!, so please can any one spoon feed me.....thanx!
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| mediocre
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.....well I guess I figured it out after some cool thinking,sorry 4 the trouble guys ,I get scared early,and 4 those who r as repulsive of genetics as i m let me decipher the facts to help others,here goes..(only 4 mediocres!!)
ii4,ii5------------are just the labels (x,y axis)for dad and mom of the woman concerned(shown with an arrow)
the bars in the box are genetic mapping of the x chromosomes of men and women ,hence only one bar for a male and two for femal to show the distribution of different x chromosomes of the mother since there is a chance that the same x chromosome might have been reused in both iii3 and iii4 as studying pointed out.
THE PEDIGREE is an XR as no females are diseased.
in an XR carrier mother atleastr50% of her son has to be affected which is not a case here so ii-5 is innocent,not a carrier,ie has no defective X to give to her daughter which may accept one of her x chromosome ,the other X comes from her father who is normal so cant have defective X (no carriers possible in males,eithr dsd or normal)
so the iii-2 female is proved not to be a carrier . QID
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