Question

evidence for evolution
how are dna and comparative anatomy used to show relatedness?
model 1 - family characteristics

1. circle the original parents in this family tree. how many children did they have?
2. place a star by the members of the family that \married into\ the family.
3. how many grandchildren did they have? ____ how many of the third generation have one or more of the grandparents traits? __ how did the third generation get these traits?________________________
4. how many individuals in generation 3 have traits that are not from the grandparents? ____ how did these traits get introduced into the family tree?

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1. which generation shares the most traits with the grandparents? generation 2 or generation 3?

________________________ which generation shares more dna with the grandparents?________

Explanation:

1. In a family tree, the original parents are the first - generation couple. By counting their direct descendants (children), we can answer the first part.
2. Members who "married into" the family are those not directly descended from the original parents but joined via marriage.
3. Grandchildren are the children of the original parents' children. Traits are passed through genetic inheritance from parents (who got them from the grandparents).
4. Traits not from grandparents can come from the "married - in" individuals.
5. Generation 2 is one step away from the grandparents (as children of the original parents), while Generation 3 is two steps. Generally, closer generations share more traits and DNA.

Answer:

1. Circle the top - most two robots (the first - generation couple). They have 3 children.
2. Place a star by the robots that are in the second generation but not direct descendants of the original parents (the ones that "married in" to form pairs with the original parents' children).
3. They have 6 grandchildren. 6 of the third - generation have one or more of the grandparents' traits. They got these traits through genetic inheritance from their parents (who inherited from the grandparents).
4. 0 (assuming no new traits from outside sources other than "married - in" in previous steps, but if considering new mutations, it could be more. But based on typical family - tree logic without mutation mention, 0). These traits (if any non - grandparent) were introduced by the members who "married into" the family (their genetic contribution).
5. Generation 2 shares the most traits with the grandparents. Generation 2 shares more DNA with the grandparents.