The answer is A or the first one
Answer:
The "short tail" dominant allele is easier to eliminate by selective breeding.
Explanation:
The only way for a recessive allele to be expressed (be visible) is when it appears as recessive homozygotic. These means the organisms need to have 2 copies of the gene. Selective breeding is based on the characteristics that one can see, so if the organism shows the "dilute" phenotype you can keep reproducing this individuals and get rid of the dominant allele.
On the other hand if you have a population with the dominant phenotype, you discard all the ones that have a recessive trait and you breed the dominant phenotype you could still get individuals with the recessive phenotype and individuals that express the dominant phenotype but are heterozygous.
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Capture-mark-recapture method is a technique commonly used to measure the size of a population. When using this technique, a number of individuals in a certain natural population are marked, returned to that population, and some of them are eventually recaptured as a basis for estimating the size of the population at the period of marking and release.
Advantages of the capture-mark-recapture method include; it is relatively costly, reliable, and its accuracy does not depend on the evaluation of the amount of habitat.
Disadvantages of the capture-mark-recapture method include; its accuracy depend on capturing a large proportion of the population, and marking of animals can have a dramatic effect on the animals.