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Natshane
 2 years ago
Is there a simple way to understand test cross of dihybrid plants? involving punnette square?
Natshane
 2 years ago
Is there a simple way to understand test cross of dihybrid plants? involving punnette square?

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yukitou
 2 years ago
Best ResponseYou've already chosen the best response.1punnett square I always use this method for my genetic question.

blues
 2 years ago
Best ResponseYou've already chosen the best response.1Yes  Punnett squares are very useful for this. A test cross is recessive for all traits of interest  so for a dihybrid cross that means, aabb where a is the first gene and b is the second.

Natshane
 2 years ago
Best ResponseYou've already chosen the best response.1thank you! However my teacher loves to give us questions where she provide us with the ratio of offsprings and we have to find the parental genotype. How do I do this kind of questions??

jazrio
 2 years ago
Best ResponseYou've already chosen the best response.1even my teacher @Natshane

Natshane
 2 years ago
Best ResponseYou've already chosen the best response.1hehehehe....I'm asking YY to teach me after class tests...

yukitou
 2 years ago
Best ResponseYou've already chosen the best response.1Use punnett square. Let say a couple has one AB type child and one O type child. You draw punnett square and filling in the child's genotype. The middle box is filled by AB and the bottom right is by Otype. Since the child receive each allele from each parent, you can 'trace back' the parental genotype. If the child is AB, one parent will have one A allele and the other will have B allele. If the child is O type, he receive each O allele from each parent. Now you can roughly figure the parent's genotype. dw:1339531802278:dw I hope this helps.

Natshane
 2 years ago
Best ResponseYou've already chosen the best response.1Oh! This seems to be so much easier to understand! Thank you @yukitou! I'll try to do it this way for my other questions. But what if the question is given ratio 148 wrinkled, yellow, 24 wrinkled green that kind of question? isn't it harder to find using a punnett square?

yukitou
 2 years ago
Best ResponseYou've already chosen the best response.1you mean dihybrid cross? The punnett square is still very useful. Let say parental genotypes are RR/yy and rr/YY where R is round, r is wrinkled, y is green and Y is yellow. When they cross, F1 genotype is Rr/Yy. dw:1339599269501:dw then, you selfcross this F1to get F2 genotype.dw:1339599523841:dw Well, you will get 4 different phenotype with 9 different genotype. The phenotype ratio is 9:3:3:1 where by 9 is R/Y, 3 is R/yy, another 3 is for rr/Y and the 1 is rr/yy. The dash means the allele can be either dominant or recessive because it still won't affect the effect of dominant allele. i hope this helps.

Natshane
 2 years ago
Best ResponseYou've already chosen the best response.1Thank you! I'll try it on my exercise questions now.
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