Complex genetics Suppose you have two rose plants both with

Complex genetics Suppose you have two rose plants, both with pink flowers. You cross the two plants and are surprised to find that, while about 50% of the offspring are pink, about 25% are red 25% are white. You decide that you like the red flowers and would like to make more. What colored roses would you cross to produce the reddest flowered plants possible and what percentage of the offspring would have red flowers? You are commissioned to produce thousands of pink flowers for an event on campus. What colored roses would you cross to produce the pinkest flowered plants possible and what percentage of the offspring would have pink flowers? Complex genetics Imagine a woman with blood type AB marries a man of blood type A. the man\'s mother is blood type O. List all the possible blood types (i.e. phenotypes) that their offspring could have: Of the possible blood types, which is the most likely to occur in their offspring?

Solution

Ans5. Cross between Pink and Pink i.e. Rr X Rr gives RR, Rr, Rr, rr.

so, Pink(Rr) = 50%

Red(RR) = 25%

White(rr) = 25%

A. To get more red flowers we cross between RR(red) and RR(red) (selfing) will give all red offsprings.

B. To produce more pink flowers we cross between RR(red) and rr(white) will give all pink i.e. Rr.

6. The man\'s mother is blood type O(I^OI^O) so man\'s father must have I^AI^A/I^AI^B and he will have I^AI^O i.e. \'A\' allele from the father and \'O\' from the mother.

A. Cross between I^AI^B(female) and IAIO(male) will produce offsprings - I^AI^A, I^AI^O, I^AI^B, I^BI^O

I^AI^A/ I^AI^O - Blood group \'A\'

I^AI^B - Blood group \' AB\'

I^BI^O - Blood group \'B\'

B^. Most likely occur blood type is group \'A\' i.e. 50%