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Q: What does the sex chromosome genotype XX produce in humans?
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Which, if any, of the following sex-chromosome aneuploids in humans are fertile: XXX, XXY, XYY, XO?
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- Human females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With respect to X-linked alleles, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many types of gametes can she produce with respect to that allele? c. If a female is heterozygous for an X-linked allele, how many types of gametes can she produce with respect to that allele?Assume that a meiotic-nondisjunction event causes trisomy 8 in a newborn. If two of the three copies of chromosome 8 are absolutely identical, at what point during meiosis did the nondisjunction event take place?An individual heterozygous for a reciprocal translocation possesses the following chromosomes: A B • C D E F G A B • C D V W X R S • T U E F G R S • T U V W X Q. Draw the pairing arrangement of these chromosomes in prophase I of meiosis.
- An individual is heterozygous for a reciprocal translocation, with the following chromosomes: A • B C D E F A • B C V W X R ST • U D E F R ST • U V W X Q. Draw a picture of these chromosomes pairing in prophase I of meiosis.A diploid (2n) trihybrid individual with the genotype EeFfGg can make eight genetically different gametes. Loci E/e and F/f are on chromosome 1 and locus G/g is on chromosome 2. Explain how a gamete containing the alleles e, f and g may be produced by meiosis. Refer specifically to meiotic events occurring during Prophase I, Metaphase I, Anaphase I and Anaphase II. (NB: remember to refer to the organism above).(d) With the random segregation of dyads, how many possible combinations are there at the end of meiosis for a diploid number of 10? (e) If half the chromosomes of a human primary oocyte segregate into the first polar body, which degenerates, why aren't some of the different kinds of chromosomes of the diploid chromosome complement absent from the egg? (f)What is the significance of the formation of polar bodies?
- A woman with a balanced reciprocal translocation of Chromosomes 4 and 20 (karyotype, right panel below) is trying to reproduce with a man of normal karyotype (left panel below). Please answer: 1) What are the karyotypes of their respective gametes ()? 2) What are the karyotypes of their potential offspring ()? 3) What are the percentages of each karyotype (gametes and offspring) ()? 4) Indicate which karyotype (of the offspring) will be lethal, carrier or normal (). 5) Do she have reduced fertility and why?If nondisjunction occurs in humans for one pair of homologous chromosomes during meiosis I. The other pairs segregate normally. a) Will any normal gametes result? b) How many chromosomes will each human gametehave? If nondisjunction occurs in humans for sister chromatids during meiosis II. The other pairs segregate normally. a) Will any normal gametes result? b) How many chromosomes will each human gamete have?Assume that a diploid cell (2N=8) contains 4 pairs of chromosomes (3 pairs of autosomes and 1 pair of sex chromosomes) designated as 1m, 1p, 2m, 2p, 3m, 3p, Xm, and Xp where "m" stands for maternal origin and "p" stands for paternal origin. Which of the following is/are possibilities for the chromosomal composition of each of the 2 daughter cells following meiosis 1? 1m, 2m, 3m, Xm AND 1р, 2р, Зр, Хр O 1m, 2p, 3p, Xm AND 1p, 2m, 3m, Xp O 1m, 1p, 2m, 2p, 3m, 3p, Xm, Xp AND 1m, 1p, 2m, 2p, 3m, 3p, Xm, Xp O 1m, 2p, 3m, Xp AND 1m, 2p, 3p, Xm
- If nondisjunction occurs in humans for one pair of homologous chromosomes during meiosis I. The other pairs segregate normally. a) Will any normal gametes result? b) How many chromosomes will each human gamete have? If nondisjunction occurs in humans for sister chromatids during meiosis II. The other pairs segregate normally. a) Will any normal gametes result? b) How many chromosomes will each human gamete have?During metaphase I of meiosis, tetrads align along the metaphase plate independently of each other. Therefore, there is a random “shuffle” of maternal and paternal chromosomes in the resulting gametes.The following diagram demonstrates how this works in a diploid cell with four chromosomes . Because there are two pairs of chromosomes and each pair can align in one of two ways during metaphase I, the number of possible variations in the gametes produced is , or .For an organism that is , there are three pairs of chromosomes, so the number of possible variations in the gametes produced due to independent assortment in metaphase I is , or . In an organism with a haploid number of , how many possible combinations of maternal and paternal chromosomes can occur in its gametes? Select one: a. 72=49 b. 27=128 c.17=1 d. 214=16 384Butterflies have an X-Y sex-determination system that is different from that of flies or humans. Female butterflies may be either XY or X0, while butterflies with two or more X chromosomes are males. This photograph shows a tiger swallowtail gynandromorph, which is half male (left side) and half female (right side). Given that the first division of the zygote divides the embryo into the future right and left halves of the butterfly, propose a hypothesis that explains how nondisjunction during the first mitosis might have produced this unusual-looking butterfly. Question is also in the picture.