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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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Anonymous sara5656
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9 months ago
1) Polydactyly is a rare human trait that causes an individual to have six digits (fingers or toes). An autosomal dominant gene causes the extra digit to develop.

Choose the correct genotypes of all individuals in this pedigree chart.

I-1 is
Answer
 

I-2 is
Answer
 

II-1 is
Answer
 
II-2 is
Answer
 
II-3 is
Answer
 
II-4 is
Answer
 
II-5 is
Answer
 
III-1 is
Answer
 
III-2 is
Answer
 
III-3 is
Answer
 
III-4 is
Answer
 

III-5 is
Answer
 
III-6 is
Answer
 

Individuals III-1 and III-2 are Answer twins.
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Anonymous
wrote...
#1
9 months ago
Can you check if the answer provided by this tutor helps?

https://biology-forums.com/index.php?topic=2035623.0

If not, please reply back and I'll try something else
Anonymous
wrote...
#2
9 months ago
It’s confusing can you help me out please
Answer verified by a subject expert
AnonymousAnonymous
wrote...
#3
9 months ago
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The pedigree is showing the autosomal dominant trait. Because there are not found skipping of trait from one generation to another. If the parent has trait, then it will pass trait to atleast some of the offspring.

The normal individuals have pp genotype.

The affected individuals have either PP or Pp genotype.

If mating between normal and affected occurs, and progenies are affected, then affected parent and affected offspring have Pp genotype. whereas normal parent and affected parent have pp genotypes.

That's why, the following genotypes are found:

I-1: Pp

I-2: pp

II-1:pp

II-2: Pp

II-3: pp

II-4: Pp

II-5: pp

III- 1: pp

III-2: Pp

III-3: pp

III-4: pp

III-5: Pp

III-6: Pp

III-1 and III-2 are fraternal twins. Because there are found different genotype. This suggests that they are produced from different zygotes.
This verified answer contains over 170 words.

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Anonymous Author
wrote...
#4
9 months ago
thanks
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