genetics question

[itzsohz]

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by looking at the pedigree,

how can u tell if it represents
1. autosomal dominant
2. autosomal recessive
3. X-linked dominant
4. X-linked-recessive

helpp plz ^^

 

[Uracil]

In pedigrees,

autosomal dominant = multiple generations affected. NO skipped generations. Males and females affected equally.

autosomal recessive when it skips generations.

x-linked recessive boys are affected and a minimal amount of girls, if any are affected. Males have only one copy of the X chromosome. So if you see in a pedigree most boys affected, it's x-linked recessive. Skipped generations.

x-linked dominant occurs in a few cases. So if you see a pedigree where multiple generations are affected then it's x-linked dominant. Also, an affected male will have none of his sons affected, but ALL his daughter will be affected.

I took genetics I and genetics II 😉 My favorite classes😍

 

[itzsohz]

tnx