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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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daveull daveull
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12 years ago
The actual question reads: A pedigree chart showing that most children have affected parents, heterozygotes have a normal phenotype, and both males and females are affected with frequency likely shows what pattern of inheritance?

A) autosomal dominant
B) autosomal recessive
C) X-linked dominant
D) X-linked recessive
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#1
12 years ago
since males and females are affected with the same frequency, the trait is not x-linked (x-linked traits will affect almost exclusively males, with females only ever being heterozygotes.)

Since the heterozygote has a normal phenotype, we know that the abnormal gene is recessive, hidden by the dominant normal gene in the heterozygote.

Therefore, the answer is B) Autosomal Recessive.
wrote...
#2
12 years ago
i would appreciate if the top contributers would stop contributing but yes hes right it is that good luck
wrote...
#3
12 years ago
If the trait were dominant, we would use the following designations: A = the trait (a genetic disease or abnormality, a = normal
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