Answers. Best Answer: Primary nondisjunction can happen during meiosis when the chromosomes fail to separate as they should. This produces gametes with more than or less than the usual number of chromosomes. Secondary nondisjunction happens during meiosis in an individual whose chromosomes are already the wrong number because of nondisjunction. So, primary nondisjunction could produce a gamete with two Xs and a zygote with XXY. When this person matures and produces gametes, secondary nondisj.
Best Romantic Winter Getaways. Go on a Wolf Safari in Yellowstone National Park. Ninety-seven percent of the 3 million-plus annual Yellowstone visitors arrive in summer, so in the off-season, couples looking for seclusion have this 2,219,789-acre park practically to themselves.
Read More On The Best Time To Travel To Tanzania For A Safari & Beach Vacation. The Northern Circuit Parks, including Serengeti, Ngorongoro Crater, Lake Manyara, Tarangire, Arusha and Kilimanjaro offer some of the most exhilarating safaris in the premier wildernesses of Tanzania. They can be visited all the year round but get heaving at peak times.