21. Which of these events cannot produce XXX individuals or mosaics? of X chromo
ID: 132611 • Letter: 2
Question
21. Which of these events cannot produce XXX individuals or mosaics? of X chromosome during first meiotic division of X chromosome during second melotic division C Mitotic nondisjunction of X chromosome D. Mitotic loss of X chromosome 22. Why is the incidence of Down syndrome syndrome very high among the offspring of a parent with Down A. One chromosome 21 cannot pair during B. One chromosome 21 cannot pair me C. Two chromosomes 21 cannot meiosis meiosis land will end up in roughly 50% of gametes. during meiosis I and will end up in nearly all of the gametes pair during meiosis l and will end up in roughly 50% of gametes pair during meiosis I and will end up in nearly all of the garmero 23-25. Wild rainbow tro fertilization of a diploid egg with a haploid sperm 80 chromosomes and are fertile. A triploid is produced by 23. What is the basic chromosome number'x for rainbow trout? A. 10 B. 20 C 30 D. 60Explanation / Answer
21. The answer is D. Mitotic loss of X chromosome
This will produce produce XO individual.
22. The answer is C. Two chromosomes 21 cannot pair during meosis I and will end up in roughly 50% of gametes.
The cell will split the chromosomes during meiosis. Since the cell is pretty dumb, it will end up with one copy on one side and 2 copies on the other.
23. The answer is C 30
2X = 60 (diploid), X will be equal to 30.
24. The answer is E. A,B and C.
Triploids are unstable in meisosis and random segregation means that balanced gametes (Exacly N or 2N) will be rare. The probabaility of a triploid organism producing a haploid gamete is (1/2)n, where n is the number of chromosomes.
25. The answer is A. 2X.
With 3X and higher the trout will be sterile and cannot reproduce.
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