Questions tagged [pedigree]

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Pedigree Analysis

I was doing some pedigree work and couldn't figure out why my answer is wrong. This chart is supposed to be an autosomal Dominant method of inheritance, but I am finding an autosomal recessive pattern ...
John Alvarez's user avatar
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What is the heredity model of the following heredity tree?

I have the following heredity tree: and I need to decide which heredity model it fits the most, with the least number of assumptions, from the following models: autosome dominant autosome recessive ...
Ilya.K.'s user avatar
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How can I confirm that this pedigree is of a pseudodominant trait?

This is an example of an autosomal recessive trait masquerading as autosomal dominant. I carried out genetic analysis for each generation as if the trait was either recessive or dominant, and both ...
Maxwell's user avatar
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3 votes
1 answer
565 views

Pedigree probability question - complete penetrance

The inheritance pattern of a common trait that shows complete penetrance is shown below: What is the kind of inheritance? If III-1 is a carrier, what is the probability of IV-1 (from III-1 and III-2 ...
Chan's user avatar
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1 answer
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Pedigree probability question

The following pedigree shows the inheritance pattern of a trait. From the following, select the possible mode of inheritance and the probability that the daughter in generation III will show the trait....
Chan's user avatar
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2 votes
1 answer
693 views

Pedigree - Dealing With Unknown Parent Genotypes

I'm dealing with a pedigree problem, and I'm having some trouble dealing with problems of unknown parental genotypes (where there are multiple possibilities). This is not a homework question; it's an ...
Axioms's user avatar
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0 answers
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Which trait does the given Pedigree chart show? [closed]

I have a doubt in this pedigree chart , according to me it should be autosomal dominant. But the ans given is X linked recessive , in the case of X linked recessive one daughter should be carrier and ...
may's user avatar
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1 answer
223 views

Is it tautological that all living humans descended from a single male and single female human ancestor?

Many popular science articles cite high sequence conservation of mitochondrial DNA and the Y chromosome among living people as evidence that all humans are descended from a single male and single ...
J--'s user avatar
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1 answer
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Assessing carrier Risk

susan has been found to be a carrier of Tay Sachs. what is the risk that her maternal aunt is also a carrier if we don't know her parents status?
Daph's user avatar
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2 answers
3k views

How can i confirm that the given pedigree chart is of an autosomal dominant trait?

This image is from the NCERT textbook. In diagram A, which represents an autosomal dominant trait, I found out that autosomal recessive inheritance also satisfies the pedigree. Yet, the NCERT text ...
Rakhal Chandran.B's user avatar
0 votes
1 answer
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How do you find probabilites of carrying an X linked recessive disease in a blank pedigree given only one phenotype?

In the above pedigree, the black square indicates the male affected with Hemophilia which is a X-linked recessive trait. What is the probability that the proposed child, which is a male (indicated as ?...
S. Pai's user avatar
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Pedigree Probability, Autosomal Recessive Trait

So, I thought I understood how to calculate the probability for a pedigree, until I came across this answer in my textbook. The question is: what is the probability the offspring of IV1 x IV2 will ...
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1 vote
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Measure of relatedness between two animals

So I am aware there is such a thing as inbreeding coefficient which is a number allocated to an individual as a result of taking the average of it's parents' inbreeding coefficient. (Note that I am ...
Avinash Shastri's user avatar
0 votes
2 answers
2k views

Does the given pedigree show a Y-linked dominant trait?

I think that since every generation has males affected only, the trait must be Y-linked. Also, since every generation expresses the trait, I think it should be dominant. However, the answer key says ...
S. Pai's user avatar
  • 15
2 votes
2 answers
2k views

Probability of carrier for recessive trait given parents are carriers and sister affected

I'm trying to understand more about inheritance of an autosomal recessive trait that runs in my girlfriend's family. How could I start looking at this? My girlfriend's sister, C, is affected with a ...
ensnare's user avatar
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3 votes
1 answer
3k views

Can someone help me with this Pedigree Analysis?

$\text{So... here is the given pedigree chart:}$ My question is ... whether this is an autosomal or a X-linked recessive trait. The book I was following gave me this info: My Attempt: Looking at ...
Abhinav Kochhar's user avatar
-1 votes
1 answer
108 views

Why can't the mutation for this simple pedigree be X-linked recessive?

http://ocw.mit.edu/courses/biology/7-012-introduction-to-biology-fall-2004/exams/finalprac.pdf For question 7a on pages 10-11 of the above link, why can't the mutation be X-linked recessive? The ...
user26014's user avatar
3 votes
1 answer
459 views

Concept and analysis of Pedigree

Pedigree analysis is a process of establishing a virtually correct inheritance pattern of a genetic condition in a proband's family. I call it virtually correct because in many a cases we assume the ...
Tyto alba's user avatar
  • 8,784
2 votes
1 answer
4k views

How to recognise the type of allele by pedigree analysis diagrams? [closed]

It was said that this interference pattern is due to dominant allele. I fail to see that. In general how to recognise the type of allele by pedigree analysis diagrams?
mathemather's user avatar
-2 votes
1 answer
6k views

What does a diamond symbol actually mean in pedigree? [closed]

Does it mean a person who is neither a male or a female, a homosexual or an individual whose sex is unspecified?
Tyto alba's user avatar
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