Saturday, November 14, 2009

In snapdragons, red × white produce pink. What proportion of pink flowers are expected from the cross pink 

A. 1/4 pink


B. all pink


C. 1/2 pink


D. 3/4 pink


E. no pink

In snapdragons, red × white produce pink. What proportion of pink flowers are expected from the cross pink 
Your cross grid should look like this because both parents have one white allele and one red allele.





-----|--R-----|---W


R---|--RR---|---RW


W--|--RW--|----WW








The Ratio is likely to be 1:1:2





The answer is B, 1/2 will be pink.
Reply:you mean the cross between two pinks then C is the answer. If you meant a red x white cross then B.
Reply:Crossing pink with pink?





Two possible answers: If we assume that the gene codes for both red and white (but that both produce pink) then it's





Answer A (traditional)


rw X rw


1/4 red (rr)


1/4 white (ww)


1/2 pink (rw)





Answer B


Be careful though, because in some cases involving color, subsequent generations do not revert.


No comments:

Post a Comment