In pea plants, purple flower color is dominant to white flower color. If two pea plants that are true-breeding?

Publish date: December 13, 2011 7:27 pm | Tags: color, dominant, Flower, Plants, Purple, truebreeding, White

for white flowers are crossed, in the offspring:

a)all of the flowers will be purple.
b)three-quarters of the flowers will be purple and one-quarter will be white.
c)half of the flowers will be purple and half will be white.
d)one-quarter of the flowers will be purple and three-quarters will be white.
e)all of the flowers will be white.

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3 Comments to “In pea plants, purple flower color is dominant to white flower color. If two pea plants that are true-breeding?”

1. Mila Says:
   December 13th, 2011 at 7:32 pm

   e) – true breeding means they are homozygous.

2. vene_puncture Says:
   December 13th, 2011 at 8:01 pm

   All of the flowers will be white. Since white color is recessive, then both white plants will have the same genotype (ww). Thus, they can only produce white offspring.

3. Lexi09 Says:
   December 13th, 2011 at 8:28 pm

   Let’s put this into view…
   Let’s make the symbol to be P:
   ~P: Dominant (Purple flowers)
   ~p: Recessive (white flowers)
   -The genotypes that will give you purple flower phenotypes will be Pp and PP.
   -The only genotype that will give you white flowers is pp.
   *The key word in the question is “true-breeding” meaning that they are homozygous for one genotype. It’s also a given since they also tell you that both parents are white flowers.
   *Thus it will be pp x pp.
   Make a punnett square. You will see that all of the offspring will have the pp genotype meaning that all of the offspring will have the phenotype of white flowers.
   Hope this helps.