Question

1. describe the location of the “blueprint” that determines the structure of each of these forelimbs as the organism develops from embryo to infant.
2. what do the similarities among the forelimb bone arrangement of these diverse animals imply about their ancestry?

which do you think would have the most similarities in dna?
read this!
extensive research has been done to find similarities and differences in the dna sequences of different animals. this work is very difficult and time consuming, but it can help biologists determine the evolutionary ancestry of a species. for example, when investigating the human genome, biologists found that about 99.5% of the dna sequences among humans are the same. considering the wide variety of traits in the human population, we are a lot more similar than we are different. humans share approximately 96% of their dna sequences with chimpanzees, 85% with mice, and 75% with chickens.

1. study the table below.

11 answer each of the questions below:
.a. to which organism, b, c or d, is organism a most closely related? support your answer.
b. which pair of organisms in the table is least closely related? support your answer.
c. which pair of organisms most likely shares a recent common ancestor? support your answer.

1. suppose another organism, organism x, is discovered. suggest how scientists would use dna comparison to classify organism x?

Explanation:

a. Organism A is most closely related to organism B. This is because the percentage of DNA similarity between A and B (97%) is higher than that between A and C (85%) or A and D (50%). Higher DNA similarity generally indicates a closer evolutionary relationship.
b. The pair of organisms least closely related is A - D. As shown in the table, their DNA similarity percentage (50%) is the lowest among the pairs (A - B: 97%, A - C: 85%, A - D: 50%). Lower DNA similarity implies a more distant evolutionary relationship.
c. The pair of organisms most likely to share a recent common ancestor is A - B. A high percentage of DNA similarity (97%) suggests that they have diverged from a common ancestor relatively recently in evolutionary time compared to the other pairs (A - C: 85%, A - D: 50%).

Answer:

a. Organism A is most closely related to organism B.
b. The pair of organisms least closely related is A - D.
c. The pair of organisms most likely to share a recent common ancestor is A - B.