2. Draw a 2n = 4 cell with one autosome and one X and one Y...
2. Draw a 2n = 4 cell with one autosome and one X and one Y chromosome during the
following stages (5 points):
(a) Anaphase 1 of meiosis, such that the X and Y chromosome are undergoing nondisjunction
(b) Anaphase 2 of meiosis, such that the autosome is undergoing non-disjunction
Homework Answers
Diagrammatically show the following steps in division of a 2n = 4 cell with 1 autosome,...
Diagrammatically show the following steps in division of a 2n = 4 cell with 1 autosome, and 1 X-chromosome, and 1 Y-chromosome in: A.) Anaphase I of meiosis
5. Draw a 2n=4 cell with one long metacentric (A/a) and one short metacentric (B/b) chromosomee...
5. Draw a 2n=4 cell with one long metacentric (A/a) and one short metacentric (B/b) chromosomee in: a. Anaphase of mitosis (6 nainte! 5. Draw a 2n=4 cell with one long metacentric (A/a) and one short metacentric (B/b) chromosomes in: a. Anaphase of mitosis (6 points) b. Anaphase II of meiosis (6 points) 6. Discuss the roles that the synaptonemal complex and the chiasma play during meiosis. What stage(s) do these structures form? (8 points)
2. Draw a cell where 2n = 6 in each phase of the cell cycle. Use...
2. Draw a cell where 2n = 6 in each phase of the cell cycle. Use a longer chromosome for Chromosome 1 and a medium chromosome for Chromosome 2 and a short chromosome for Chromosome 3 and use two different colors to represent the maternal and paternal chromosomes. Be sure to clearly indicate what is going on with the 1-nuclear envelope, 2-centrosomes, 3-chromosomes in each of the stages. prophase/ prophase 1/ prophase 2 metaphase/ metaphase 1/ metaphase 2 anaphase/ anaphase...
1. A diploid cell with two pairs of chromosomes is undergoing meiosis. Draw this cell as...
1. A diploid cell with two pairs of chromosomes is undergoing meiosis. Draw this cell as it would appear during metaphase I. Then draw one of the daughter cells as it would appear during anaphase II. (8 points)
1. An organism is described as 2n = 58. How many chromosomes are in one meiotic...
1. An organism is described as 2n = 58. How many chromosomes are in one meiotic cell during telophase 1? 2. An organism is described as 2n = 58. How many chromatids per chromosome are in one mitotic cell during metaphase? 3. An organism is described as 2n = 58. How many chromatids per chromosome are in one meiotic cell during Anaphase 2? 4. An organism is described as 2n = 58. How many chromatids per chromosome are in one...
22. [9 PTS] Turner syndrome results when an individual has a genotype of XO (a single...
22. [9 PTS] Turner syndrome results when an individual has a genotype of XO (a single X chromosome), and no other sex chromosomes. Color-blindness results from mutation of a single gene on the X chromosome. A couple, both of whom have normal color vision, have a color-blind child with Turner's syndrome. a. Did non-disjunction occur in the mother, or the father, or is it impossible to tell? Explain your answer. (3 pts) (continued next page. b. In the space provided...
X-linked hypophosphatemia (XLH) is due to a rare X-linked dominant form of rickets. A man with...
X-linked hypophosphatemia (XLH) is due to a rare X-linked dominant form of rickets. A man with XLH marries a healthy woman and they have a son with XLH. The MOST LIKELY explanation for this occurring is: A. During spermatogenesis in the father, Meiosis I non-disjunction of the X chromosome generated a disomic sperm. B. During spermatogenesis in the father, Meiosis II non-disjunction of the X chromosome resulted in a disomic sperm. C. During oogenesis in the mother, Meiosis I non-disjunction...
Consider a human germ cell undergoing normal meiosis (with only chromosome 23 shown). The dark blue...
Consider a human germ cell undergoing normal meiosis (with only chromosome 23 shown). The dark blue represents the maternal chromosome and the light blue represents the paternal chromosome. Which of the 6 possible gamete types would you observe following the completion of meiosis (Choose all that apply)? 3. Consider the same human germ cell. If a single chromosome nondisjunction event occurs during meiosis I, which gamete types will you expect following the completion of meiosis (Choose all that apply)? 4....
The diagram represents such a meiosis beginning with a diploid cell containing synapsed chromosome 18’s (bivalent).As...
The diagram represents such a meiosis beginning with a diploid cell containing synapsed chromosome 18’s (bivalent).As primary nondisjunction, draw in chromosome 18 in all of the cells shown, and on the lines provided write the chromosome formula (in number) and the total number of chromosomes in every cell. Cell 2n and 46 Meiosis 1 Cell 1 Cell 2 ? and ? ? and ? Meiosis 2 Cell 1 Cell 2 Cell 3 Cell 4 ? and ?----->
Non-disjunction of an autosome during Anaphase II results in: Select one: a. Two normal gametes, 1...
Non-disjunction of an autosome during Anaphase II results in: Select one: a. Two normal gametes, 1 diploid gamete, and one nullosome b. Two normal gametes, and two nullosomes c. Two diploid gametes, and one nullosome d. Two diploid gametes, and two nullosomes e. None of the above
5. Draw a 2n=4 cell with one long metacentric (A/a) and one short metacentric (B/b) chromosomee in: a. Anaphase of mitosis (6 nainte! 5. Draw a 2n=4 cell with one long metacentric (A/a) and one short metacentric (B/b) chromosomes in: a. Anaphase of mitosis (6 points) b. Anaphase II of meiosis (6 points) 6. Discuss the roles that the synaptonemal complex and the chiasma play during meiosis. What stage(s) do these structures form? (8 points)
1. A diploid cell with two pairs of chromosomes is undergoing meiosis. Draw this cell as it would appear during metaphase I. Then draw one of the daughter cells as it would appear during anaphase II. (8 points)
22. [9 PTS] Turner syndrome results when an individual has a genotype of XO (a single X chromosome), and no other sex chromosomes. Color-blindness results from mutation of a single gene on the X chromosome. A couple, both of whom have normal color vision, have a color-blind child with Turner's syndrome. a. Did non-disjunction occur in the mother, or the father, or is it impossible to tell? Explain your answer. (3 pts) (continued next page. b. In the space provided...
Consider a human germ cell undergoing normal meiosis (with only chromosome 23 shown). The dark blue represents the maternal chromosome and the light blue represents the paternal chromosome. Which of the 6 possible gamete types would you observe following the completion of meiosis (Choose all that apply)? 3. Consider the same human germ cell. If a single chromosome nondisjunction event occurs during meiosis I, which gamete types will you expect following the completion of meiosis (Choose all that apply)? 4....
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