What is the difference between autosomal recessive and autosomal dominant?

[Lazerous]

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This is in relation to question 102 in bio destroyer, but I just want to know the difference between those two AND the difference between X-linked recessive and X-linked dominant modes of inheritance.

Thanks!

 

[futuredent22]

This is in relation to question 102 in bio destroyer, but I just want to know the difference between those two AND the difference between X-linked recessive and X-linked dominant modes of inheritance.

Thanks!

I'd go back and re-read your genetics chapter. This forum is great for asking questions about minor details, but your question indicates to me that you still need to do more reading.

for question 102, its dominant because its not skipping generations. x-linked recessive and dominant is the same exact thing as autosomal, but its on the x-chromosomes. in terms of the pedigree, almost only males would have the disease if it was x-linked recessive.

as i said before, simply memorizing my explanation and the destroyer's explanation won't do you any good. I'd go back and give the chapter another read.

 

[Lazerous]

So autosomal recessive/dominant has nothing to do with homozygous or heterozygous?

So for pea plans Tt is heteryzygous for tall and tt is homozygous recessive for short. This does not relate to the autsomal recessive/dominant we are talking about?

 

[futuredent22]

haha it is exactly what we are talking about. Tall is the dominant gene and short (t) is the recessive.

 

[Lazerous]

haha it is exactly what we are talking about. Tall is the dominant gene and short (t) is the recessive.

Oh ok, I was just confusing myself then. 😀
But wait, in the diagram for 102, doesn't a shaded shape mean they are expressing the recessive phenotype so they must be homozygous recessive? Or does the shaded simply mean they are EITHER carriers OR they are expressing the recessive phenotype?

 

[futuredent22]

The shade means they are expressing the phenotype. It doesn't tell you any more than that. you have to infer from the pedigree what the genetics of the phenotype are based on what/how many individuals express the phenotype.

Definitely go read your bio textbook chapter on this stuff. This isn't something that should be memorized, but understood.

 

[Lazerous]

The shade means they are expressing the phenotype. It doesn't tell you any more than that. you have to infer from the pedigree what the genetics of the phenotype are based on what/how many individuals express the phenotype.

Definitely go read your bio textbook chapter on this stuff. This isn't something that should be memorized, but understood.

Got it! Thanks for your help! 👍

 

[klpennin]

When they say autosomal, its just a fancy word for a normal chromosome (Not a sex chromosome), while x and y are sex chromosomes.

In a pedigree, the shaded means that they are expressing the phenotype, so you should infer that if a womens father is showing positive, then she will be a carrier, and her son may have the disorder. Sex linked disorders go Father to Daughter to Son. Never Father to son.

 

[Contach]

Got it! Thanks for your help! 👍

lol. he's not going to read the textbook.

 

[whoispittsnogle]

excuse me, is it true that if you don't use it, you lose it?
is this a serious qeustion!?