Three living species X, Y and Z share a common ancestor T as do the extinct species A and B. A and B are sister taxa. Which statements about the relationships between species T, X, Y, Z and A and B are CORRECT ?Question 15Answera.A and B share the common ancestor Tb.we can deduce that all species T, A, B, X, Y and Z form a clade c. T, X, Y and Z form a claded. B has shared derived characteristics of X
Question
Three living species X, Y and Z share a common ancestor T as do the extinct species A and B. A and B are sister taxa. Which statements about the relationships between species T, X, Y, Z and A and B are CORRECT ?Question 15Answera.A and B share the common ancestor Tb.we can deduce that all species T, A, B, X, Y and Z form a clade c. T, X, Y and Z form a claded. B has shared derived characteristics of X
Solution
a. This statement is correct. A and B are sister taxa, which means they share a common ancestor. In this case, the common ancestor is T.
b. This statement is correct. A clade is a group of organisms that consists of a common ancestor and all its lineal descendants. In this case, T is the common ancestor and A, B, X, Y, and Z are its descendants.
c. This statement is correct. T is the common ancestor of X, Y, and Z, so they form a clade.
d. This statement cannot be confirmed with the information given. We know that B is a sister taxon to A and they both share a common ancestor with T, X, Y, and Z. However, we do not have information about the specific derived characteristics of these species, so we cannot confirm whether B has shared derived characteristics with X.
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