Answer:
Dominant
Explanation:
If both of the parents don't express the trait and the child does, then the pedigree is recessive. According to Mendel's law, the recessive trait will only show if there are two recessive alleles. If both of the parents of have the trait and their child does, that means that the parents are heterozygous.
If one of the parents have the trait and the child does or doesn't, then the pedigree is dominant.
Answer:
Crude oil is the main source
Explanation:
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It allows them to be flattened on a microscopic slide, so that the chromosomes of individual cells can be observed easily.