In a plant, red flower color is incompletely dominant over yellow. What will the distribution of flowers in the F2 hybrids be if we start out with 60 F1 hybrids?

Question

anonymous · Answer

Alright, so we know that we start out with 60 F1 generation hybrids. Therefore, these plants  (because they are hybrids) will have both alleles, which means that they will be a blend of red and yellow. If you represent the red allele with the letter "A"  and the yellow allele as "a", then the f1 hybrids will have a genotype of Aa, and will be orange because neither red nor yellow is dominant. 

Now, if you cross two hybrid plants using a Punnett Square, you can estimate what the distribution of the F2 generation will be:

|dw:1405911030236:dw|

Thus, 50% of the offspring (F2 generation) will be hybrids as well. So if you want to figure out how many there will be in relation to the numbers of the F1 generation, simply multiply 50% by 60. 

0.5 x 60 = 30.

Therefore, 30 of the flowers of the F2 generation will be hybrids. 

Hope this helps!

deepika.comet · Answer

very good..!! @espresso