Some people prefer to eat Wagyu cattle because of the high level of marbling (fat) in the meat - VCE - SSCE Biology - Question 5 - 2009 - Paper 1
Question 5
Some people prefer to eat Wagyu cattle because of the high level of marbling (fat) in the meat. Four separate DNA markers are used to test for marbling in an animal.... show full transcript
Worked Solution & Example Answer:Some people prefer to eat Wagyu cattle because of the high level of marbling (fat) in the meat - VCE - SSCE Biology - Question 5 - 2009 - Paper 1
Step 1
What does use of four markers suggest about the inheritance of this characteristic?
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Answer
The use of four markers indicates that the marbling characteristic is likely polygene inheritance. This means that multiple genes contribute to the trait, rather than it being controlled by a single gene.
Step 2
Given that the gene probe for a human works for the Wagyu, what can you infer about the chemical code for this allele?
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Answer
This suggests that the chemical code for the Wagyu CHS allele is very similar or identical to that of humans, indicating a conserved genetic relationship between the two species.
Step 3
In the bacterial cell above, draw a plasmid in the blank box.
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Here, a plasmid can be illustrated as a small, circular piece of DNA, independent of the chromosomal DNA, easily marked with a label for clarity.
Step 4
Why are YACs made with a centromere?
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Answer
YACs are made with a centromere because this allows for proper segregation of the YAC during cell division, ensuring that each daughter cell receives a copy of the YAC along with its genetic material.
