Question

Duchene muscular dystrophy, or DMD, is a recessive, x-linked disease. What would you expect to see in the offspring of a woman who has DMD and a man who does not have the disease?

All of their sons and none of their daughters would have the disease.
None of their children would have the disease, but they would all be carriers.
All of their daughters and none of their sons would have the disease.
Their daughters would have the disease and their sons would be carriers.

Answer 1

I think it's the last one.

Answer 2

Hello @Julie_AP !

Answer 3

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Answer 4

Why do u think d ?

Answer 5

Because to exhibit a certain trait it has to show up twice, i think. In other words, since a female is made up of 2 x's and the disease is x linked, they will have the disease, but males will just carry it.
Or...I'm completely wrong

Answer 6

ohkay lets see, let's represent the recessive allele by x and dominant normal allele by X

Answer 7

u getting the cross ?

Answer 8

yeah...But, I still can't put an answer together

Answer 9

Dont worry lets conclude

Answer 10

Mother had DMD, so she was having two recessive x chromosomes, Father was neither diseased nor carrier so he was having one X and one Y

Answer 11

When we crossed them we got the above punnet square which shows each of them will have only one x(DMD) chromosome.

Answer 12

So all of the offsprings are carriers but no one is diseased

Answer 13

Got it ?

Answer 14

yeah, thank you :)

Answer 15

You've saved my life, I am eternally grateful.

Answer 16

\(\color{red}{\huge\bigstar}\huge\text{You're Most Welcome! }\color{red}\bigstar\)
\(~~~~~~~~~~~~~~~~~~~~~~~~~~~\color{green}{\huge\ddot\smile}\color{blue}{\huge\ddot\smile}\color{pink}{\huge\ddot\smile}\color{red}{\huge\ddot\smile}\color{yellow}{\huge\ddot\smile}\)

Answer 17

Oh I didn't know how to do that. LOL

Answer 18

Now u know
\(\color{green}{\huge\ddot\smile}\)