When can two parent plants with purple flowers produce
offspring with white flowers?

if purple is the dominant allele (P) and white is the recessive allele (p) then it would be possible if both parents had the genotype Pp, then it would be possible for both parents to pass on the recessive gene (p) and have offspring with white flowers

Explanation:

chromosomes carry the genetic information for organisms. also, chromatin is the thread like dna which is located in the nucleus of an organism.

coal is not sustainable because it will one day run out.