What is an allele? A. A group of chromosomes
B. A gene that causes a specific trait
C. An organism that lives in Eukaryotes
D. A chromosome that determines gender

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

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