Please help with biology question!

Biology
Tutor: None Selected Time limit: 1 Day

Jun 10th, 2015

Thank you for the opportunity to help you with your question!

a) it is a sex-linked disorder

b) punnet square

Dad (the small a represents the trait for the disorder): 

Xa Y 

X XXa XY 

X XXa XY 

Mom: 

X Y 

Xa XXa XY 

X XX XY

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 10th, 2015

Hi and thank you for taking the time to answer my question! 

I need some clarification please..

For part A of the question could you explain to me why it is a sex-linked disorder or why the pattern of inheritance is sex-linked? 

For part B the punnett square, i understand the punnett square for the father because it is passed down to only the daughters. But for the punnett square for the mother it is supposed to be passed on to half of their children. In the punnett square you provided it is only passed on to one of the daughters could you explain why that is? 

Jun 10th, 2015

Hi and thank you for taking the time to answer my question! 

I need some clarification please..

For part A of the question could you explain to me why it is a sex-linked disorder or why the pattern of inheritance is sex-linked? 

For part B the punnett square, i understand the punnett square for the father because it is passed down to only the daughters. But for the punnett square for the mother it is supposed to be passed on to half of their children. In the punnett square you provided it is only passed on to one of the daughters could you explain why that is? 

Jun 10th, 2015

Sorry it got repeated twice..

Jun 10th, 2015

Hi and thank you for taking the time to answer my question! 

I need some clarification please..

For part A of the question could you explain to me why it is a sex-linked disorder or why the pattern of inheritance is sex-linked? 

For part B the punnett square, i understand the punnett square for the father because it is passed down to only the daughters. But for the punnett square for the mother it is supposed to be passed on to half of their children. In the punnett square you provided it is only passed on to one of the daughters could you explain why that is? 


Jun 10th, 2015

it is X linked because female gets one X from her mom and one X from dad , so when her dad's X is dominant means it may occur. X is consider be the chromosome for Hypophosphatemia. 


now the daughter has Xx Hypophosphatemia 

cross with Xx * xy 

=> Xx Xy xx xy 

thus 50% of population having the Hypophosphatemia

Jun 10th, 2015

for part B again would the mother have no allele on her X chromosome?

Jun 10th, 2015

I wrote Xx, "X" in this case represent the chromosome with hypophosphatemia allele 

Jun 10th, 2015

you are kinda confusing me..

I'm sorry but I am certain that you did not do part b correctly. I even found the site you got the answer off of.

I am going to try and repost the question. Thanks for trying. 







Jun 10th, 2015

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