The timing of completion of meiosis differs between males and females. With this

Question

The timing of completion of meiosis differs between males and females. With this in mind, if you had a litter of puppies and two of the puppies (one male and one female) you decided to keep as breeding animals.

1. A) If you had an illness in the puppies that occurred after puberty that resulted in damage to the gonads, what would be the reproductive outlook for your male and female puppy? (2 pts)

1. B) What if this illness had occurred prior to puberty? Do you think it would have made a difference in the reproductive outlook for your puppies? (2 pts)

2) In humans, there are some genetic disorders that are increased with advanced maternal age. For example the risk of having a child with trisomy 21 (Down syndrome) increases from 1 in 526 at age 20 to 1 in 8 at age 49. Is this also an issue in livestock or companion animals? Why or why not? (2 pts)

Explanation / Answer

1A)I would keep the puppies because there is a fair chance that the puppies with breed after puberty before the disease affects them.The disease might even begin to affect gonads long after they have already had progenies.

1B)If the disease affects the puppies before puberty then they will not be able to reproduce and ofcourse the reproductive outlook would have changed.Anyone who is interested in the puppies from their breeding or reproductive point of view would no longer be interested.

2)No such disorders are not seen in puppies because of maternal age.Although dogs may have down syndrome but it is not due to older mother.This is because unlike humans dogs do not have a monthly cycle .They have estrous cycle.No menopause is fpund in case of dogs.In humans with progress in age the formation and development of ovum becomes lesser and defective with old age and stops at menopause but no such phenomena is seen im dogs.

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