If two white flowered plants are crossed, what % of their offspring will be white flowered?

If purple flowers are dominant to white flowers... And could you explain why, because I don't understand..



Thanks %26lt;3

If two white flowered plants are crossed, what % of their offspring will be white flowered?
All of their offspring will be white. This is because white flowers are recessive, with a genotype of (rr). When you cross 2 rr (homozygous recessive) plants, all of the offspring will also be rr.



r r

r rr rr

r rr rr



If you had two purple plants with a genotype of Rr (heterozygous), you would have different results.



R r

R RR Rr

r Rr rr



Here, the ratio of genotypes (what the genes are) would be 1:2:1 and the ratio of phenotypes (what they look like) would be 3:1. This is because purple is dominant and if there is at least one capital R (dominant), then the flowers will be purple. If there are two lower-case r's, then the flowers will be white.



I hope that this helps.
Reply:white to white makes white--"aabb plus aabb"

If you crossed a purlpe into a white, in your first generation "F1" of cross, all four possibilities will be purple because purple is dominant. look at a chart--

purple will equal AB

white will equal ab

The four possiblities are AaBb = purple

purple has 100 % chance of showing up and White has 0 % chance.

But if you cross those seeds again, second generation, "F2" white will have a 1/16 % chance overall
Reply:all the answers that correct, a white flower has no pigment and so it is always going to be regressive. White flowers can only produce white flowers if bred with white flowers, but did you know that some colors are only half dominant, for example; a red flower bred with white will make pink. Think about it.
Reply:If either of the parent flowers had *any* purple in them at all, it would SHOW. The petals would be purple. A crossbreed flower is a purple (hybrid) flower; it is not a white (hybrid) flower. Since purple is dominant, there can be no white hybrids.



So both of the parent flowers are lily white and racially pure, having none of that purple in them, and therefore their children will also be white.
Reply:All of their offspring will be white. If Purple is the dominant gene, any flower with one purple gene will not be pure white. Meaning white flowers only have the white gene and there is no way possible for two white flowers to produce anything other then a white flower.
Reply:you'd get white. if purple is dominant (PP) and you cross 2 white flowers (ppX pp) you'd get all white flowers because the law of ressiveness. (sp?) You wouldn't have any big P's so none of the flowers would be Purple. Big P's dominate the little p's.