QUESTION IMAGE
Question
- what separates rabbits/primates from the crocodiles on this cladogram? hair
- which organism is most related to the rodents and rabbits on this cladogram? primates
- what 5 traits do bird and its closest relative share?
a. eggs with shell
b. amniotic egg
c. four limbs
d. bony skeleton
e. vertebrate
- which organism will have dna most similar to the bird? why?
- which organism’s dna will differ the most from the bird? why?
Question 8
To determine what separates rabbits/primates from crocodiles on the cladogram, we analyze the derived characteristics (traits) at each branch. Looking at the cladogram, the trait "Hair" is present in the branch leading to rabbits, primates, etc., but not in the branch leading to crocodiles. Crocodiles do not have hair, while rabbits (mammals) and primates (mammals) have hair as a defining mammalian trait. So the trait that separates them is hair.
On a cladogram, organisms that share a more recent common ancestor are more closely related. Looking at the cladogram, rodents and rabbits (along with primates) share a more recent common ancestor (the branch with "Hair" and subsequent branches) compared to other organisms. The cladogram shows that rodents and rabbits are in the same major branch after the "Hair" trait, so the organism most related to rodents and rabbits is the other group in that branch, which would be primates (or each other, but among the options or context, the closest is the group sharing the most recent node. Since rodents and rabbits are both in the mammalian group with primates, the primates are closely related, but also rabbits and rodents are closely related. But from the cladogram, the node before rodents and rabbits splits is shared with primates? Wait, no—looking at the cladogram structure: after "Hair", the branch splits into primates, rodents & rabbits, and then others? Wait, the cladogram has "Hair" as a trait, then the next branches. So rodents and rabbits are in a group, and primates are another, but the closest to rodents and rabbits would be each other, but if we look at the options (the question says "which organism is most related to the rodents and rabbits"—probably primates? Wait, no, the cladogram shows that after "Hair", the line splits into primates, and then a line that splits into rodents/rabbits and then crocodiles/birds? Wait, no, the image shows: Vertebrate → Bony skeleton → Four limbs → Amniotic egg → Eggs with shell (splits into Crocodiles and Birds) and before that, from Amniotic egg, there's a branch with Hair, which splits into Primates, Rodents & rabbits. So the organisms most related to rodents and rabbits are primates (since they share the "Hair" and the branch before splitting into primates vs rodents/rabbits). So the organism most related is primates (or rodents/rabbits to each other, but the question is "which organism", so likely primates or the other in their clade.
To find what trait birds and their closest relative (crocodiles, from the cladogram) share, we look at the traits. The cladogram shows that before the split into crocodiles and birds, the trait is "Eggs with shell". So birds and crocodiles (their closest relative here) share the trait of eggs with a shell. Let's check the options: a. Eggs with shell – this matches. b. Amniotic egg – both have amniotic egg, but the closest relative (crocodiles) and birds share "Eggs with shell" as the most recent shared trait. Wait, the cladogram: after Amniotic egg, there's a branch with "Eggs with shell" that leads to Crocodiles and Birds. So the trait they share is eggs with shell. So option a.
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Hair