Biologists think that endosymbiosis gave rise to mitochondria before plastids partly because: (All eukaryotes have mitochondria whereas many eukaryotes do not have plastids)
It is called the seed coat
Answer:
Codominant alleles or Incomplete dominance.
In codominance, the results are mixed, and both show. Incomplete dominance is when the results blend (red + white flower = pink flower)