Since the trait is dominant, it is possible for his parents to be heterozygous (Bb). So they have the trait but they have a gene they can pass on with out it. If both of his parents Bb then he could’ve gotten both recessive and therefore not receive the trait
Rough endoplasmic reticulum or RER for short.
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If it has valves then it is a vein.
Answer:
observe, question, research, hypothesize, experiment, test hypothesize, draw conclusions, report
I believe the correct answer is B. Detrital