PEDIGREE ANALYSIS: PRACTICE PROBLEMS
https://youtu.be/4nfdm6hT-r8
Q1. Identify the inheritance pattern in the following picture.
The above pedigree is X-linked dominant because of the following reasons:
1. Dominant because there is no skipping of generation.
2. X-linked dominant condition must follow DDD rule (the first D represents dominant condition; the second D represents affected D; the third D represents daughters). It means, in a dominant condition, if dad is affected, all his daughters will be affected too.
3. The above pedigree follows DDD rule.
Q3. Identify the mode of inheritance.
Autosomal dominant
No DDD rule followed in the above pedigree
Q4. Identify the pattern of inheritance.
Autosomal recessive
No X-linked recessive condition followed.
Q5. Identify the pattern of inheritance.
X-linked recessive
Followed X-linked recessive condition.
It is recessive because two unaffected parents produced affected offspring -- a characteristic of recessive trait.
Q6. Find the pattern of inheritance in the following pedigree and write the genotype of III 7
Q7. Find the pattern of inheritance and the genotype of the parents
Q1. Identify the inheritance pattern in the following picture.
The above pedigree is Autosomal recessive.
- Recessive because there is skipping of generation.
- Autosomal recessive because, it does not fulfill X-linked recessive condition.
For X-linked recessive, following conditions must be fulfilled:
- More boys affected than girls
- Female does not affect female
- Affected mom has to have affected sons as well as dad
Q2. Identify the mode of inheritance.
1. Dominant because there is no skipping of generation.
2. X-linked dominant condition must follow DDD rule (the first D represents dominant condition; the second D represents affected D; the third D represents daughters). It means, in a dominant condition, if dad is affected, all his daughters will be affected too.
3. The above pedigree follows DDD rule.
Q3. Identify the mode of inheritance.
No DDD rule followed in the above pedigree
Q4. Identify the pattern of inheritance.
No X-linked recessive condition followed.
Followed X-linked recessive condition.
It is recessive because two unaffected parents produced affected offspring -- a characteristic of recessive trait.
Q6. Find the pattern of inheritance in the following pedigree and write the genotype of III 7
quite easy questions....... please upload some more !
ReplyDeleteThis comment has been removed by the author.
Deletehow is 5 question xlinked
Deletehow are you able to solve please suggest me too
Delete@S. EZHIL RAJ ADVOCATE, coz in the 2nd generation the mother is the carrier who is carrying this recessive allele hence her son is affected.
Deletebetter to student....please upload more
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ReplyDeleteThese were basic...hoping for further tasking questions...
ReplyDeleteWhat's d answer of 6th one?
ReplyDeleteThe answer for question no.6 is Autosomal dominant.
DeleteAutosomal because male child and female child got trait from there parents
And dominant because each generation has a trai..
Autosomal dominant
DeleteNot recessive because
1. Affected son (7) has unaffected mother (3)
2. Affected mother (4) has unaffected daughter (8)
I think it is x linked recessive
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ReplyDeletePooja, the answer to question 6 is Autosomal dominant. It is dominant because there is,no skipping of generation and it is Autosomal dominant because it doesn't follow DDD rule. The genotype of III 7 is As.
ReplyDeletevery helpful and makes us understand easily
ReplyDeletePlz add some more Qs...I would lyk 2 know more
ReplyDeleteWhat's the answer of sixth one
ReplyDeleteI think its autosomal dominant
Plz reply
Yes. It is autosomal dominant
ReplyDeleteI think its an autosomal dominant trait
ReplyDelete6. and 7. both will be autosomal dominant
ReplyDeleteWhat about Q2,,, It's is also following Autosomal dominant Cross
ReplyDeletePlz explain
Answer 7???
ReplyDeleteI spent hours trying to learn this but this helped me understand it in seconds.
ReplyDeleteAwesome, plz post few more q on genetics
ReplyDelete5 ques can also autosomal recessive as well as x linked recessive
ReplyDeleteboth answers are correct
Is question no 5 not y linked?
ReplyDeleteIt's very helpful and easy to learn
ReplyDeleteCan question 4 be XLR since carrier mothers to affected sons and males are more affected in that pedigree?
ReplyDeleteQ6- answer: it is AUTOSOMAL DOMINANT and genotype of III-7 is Aa.
ReplyDelete