You have been hired to create a cat that will not cause allergic reactions in ca

Question

You have been hired to create a cat that will not cause allergic reactions in cat-lovers. Your co-workers have cloned the gene encoding a protein found in cat saliva, expressed the protein in bacteria, and shown that it causes violent allergic reactions in people. But you soon realize that even if you succeed in making a knockout cat lacking this gene, anyone who buys one will easily be able to make more hypoallergenic cats just by breeding them. Which of the following will ensure that people will always have to buy their hypoallergenic cats from you?

(a) Injecting the modified ES cells into embryos that have a genetic defect that will prevent the mature adult from reproducing.
(b) Implanting the injected embryos into a female cat that is sterile due to a genetic defect.
(c) Selling only the offspring from the first litter of the female cat implanted with the injected embryos.
(d) Surgically removing the sexual organs of all the knockouts before you sell them.
(e) Selling only male knockouts.

Explanation / Answer

a) , b) and d) are all right.

c) is not correct because the genemanipulation doesn't fade in time

e) is not correct because as long as the gene is present and the individual is able to have offspring, this doesen't work

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