Pooh had a colony of tiggers whose stripes went across the body. His American pe
ID: 10445 • Letter: P
Question
Pooh had a colony of tiggers whose stripes went across the body. His American pen pal, Yogi, sent pooh a tigger whos stripes went lengthwise. When Pooh crossed that tigger with one of his own animals, the offspring were all plaid. Interbreeding among the plaid tiggers produced litters of mostly plaid tiggers, a few crosswise-striped tiggers, and a few lengthwise-striped tiggers. Diagram the corsses made by pooh, showing the genotypes of the tiggers that account for the coat patterns observed. Show all Punnett squaresThank You
Explanation / Answer
I don't know how many punnet squares are needed and I don't know if there is such a thing as a tigger with no stripes but since I don't see any nonstripe tiggers being made, then I'll just make the assumption that the first parents have strictly two of the same kind of genotype.
How I figured this problem out is by drawing a punnet square. Then I represented the lengthwise trait with an AA genotype and the across the body genotype with BB.
Just in case anyone didn't know, Genotypes come in pairs (hence where the dominant, recessive, hybrid traits come about) and phenotypes are the physical manifestations of the paired genotypes.
Then, I placed an A above both of the top two squares and a B to the left of the two left side squares. The top letters represent the "across the body" striped tigger parent and the letters to the left represent the genotype of the lengthwise striped parent. Place the corresponding letters that are above and beside the squares inside each square, so that the configuration should look like:
A (-) A(-)
B(I) AB(+) AB(+)
B(I) AB(+) AB (+)
The AB's represent the genotypes of the offspring, in this case the plaid offspring. If you still don't see it, look at the symbols in the parentheses, where (-)= stripes across the body, (I)= lengthwise, and (+)=plaid. Then make another punnet square with just the offspring's genotypes
A(-) B(I)
A(-) AA (-) AB (+)
B(I) AB (+) BB(-)
This punnet square explains how the plaid offspring will mostly produce offspring with plaid stripes and a couple of across the body striped tiggers and a few lengthwise striped tiggers (the ratio is 2:1:1, so twice as many plaid tiggers as there are lengthwise or across the body striped tiggers). I hope this helps!