1. The diagram shows an evolutionary tree for the whale genus Mystictes - Edexcel - GCSE Biology - Question 1 - 2018 - Paper 1
Question 1
1. The diagram shows an evolutionary tree for the whale genus Mystictes.
The bar next to each genus indicates how much time that genus inhabited the Earth.
(i) Name... show full transcript
Worked Solution & Example Answer:1. The diagram shows an evolutionary tree for the whale genus Mystictes - Edexcel - GCSE Biology - Question 1 - 2018 - Paper 1
Step 1
Name each genus shown in the diagram that is not extinct.
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Answer
The genera that are not extinct as shown in the evolutionary tree are:
Hippopotamus
Odontocetes
Mystictes
Step 2
5.5 million
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Answer
The genus Mystictes inhabited the Earth approximately 5.5 million years ago.
Step 3
A suggestion to include two of the following:
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Answer
One could suggest that Rhodocetus had a:
thinner skull (in Dorudon), making it more streamlined for swimming
also, it could be suggested that it had:
more pointed/thinner teeth (in Dorudon) to grip fish or prey better.
Step 4
Explain the effect of prebiotics on the population of beneficial bacteria.
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Answer
Prebiotics serve as a food source for beneficial bacteria, allowing them to flourish. This increase arises because these bacteria can utilize the oligosaccharides present in prebiotics, leading to their higher population density in environments where prebiotics are available.
