3- In nondisjunction disorder, if it happens in meiosis I, it will be to if it happens in meiosis II. a) Less b) More c) Both have the same impact d) None of the above harmful Compared
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- 16. Which of the following statements describes a major difference between mitosis and meiosis I in a diploid organism? A) Sister chromatids separate in mitosis, while homologous pairs of chromosomes separate in meiosis I. B) Sister chromatids separate in mitosis, while homologous pairs of chromosomes separate in meiosis II. C) DNA replication takes place prior to mitosis, but not before meiosis I. D) Only meiosis I results in daughter cells that contain identical genetic information. 17. Which of the following events happens at the conclusion of meiosis I? A) Homologous chromosomes of a pair are separated from each other. B) The chromosome number per cell remains the same. C) Sister chromatids are separated. D) Four daughter cells are formed. 18. Refer to the drawings in the figure below of a single pair of homologous chromosomes as they might appear during various stages of either mitosis or meiosis, and answer the following question. Which diagram represents anaphase I of meiosis?…which of these could lead to the mistake evident in the karyotype? A) a failure of cytokinesis after meiosis I in gamete formation B) a nondisjunction in meiosis II in gamete formation C) crossing over in meiosis ! in gamete formation D) fertilizaton by two sperm in zygote formationA man DDGG has a child with a woman is Ddgg. Their child is DDGgg. What happened to create this embryo (assume no crossing over occurs during meiosis for this problem)? A) The embryo is normal B) Non-disjunction in meiosis I in the father C) Non-disjunction in either meiosis I or meiosis II in the father D) Non-disjunction in meiosis I in the mother E) Non-disjunction in meiosis I or meiosis II in the mother
- 12) During meiosis, crossing-over may occur. Crossing over usually results in A) Overproduction of gametes B) Fertilization and development C) The formation of identical offspring D) Genetic variation within the speciesItosis 48) Which best describes the process of independent assortment? A) The way one pair of homologous chromosomes lines up along the metaphase plate does not affect how any other pair lines up B) Segregation of chromosomes during meiosis I is independent of their segregation during meiosis II C) During crossing over, chromosomes pair up at random D) Crossing over along one pair of chromosomes is independent of crossing over along the other pairsIV. Observation: No Crossing Over Crossing Over Appearance of Gamete Cells Appearance of Gamete Cells V. Analysis: 1. If the two sister chromatids are the same, how are they called? 2. Which specific parts exchanged genetic information during cross over? 3. What is crossing over? 4. When will crossing over occurs? Why? 5. What will happen after crossing over? 6. How do meiosis contributes to genetic variation, while mitosis does not? 7. Why is crossing over important for evolution of species?
- 3. Identify the stage of meiosis for the following cells: а. b. с.5- An individual with a trisomy is an example of: I. an aneuploid individual II. a hypoploid individual II. a hyperploid individual IV. an autopolyploid individual a) O only IV 7020 b) I and III c) I and II d) only III e) I and IV Boş bırak2) Explain how nondisjunction in meiosis is responsible for chromosome abnormalities such as Down syndrome, Klinefelter syndrome, and Turner syndrome.
- Genetic problems: Use the diagram below to figure out how each monosomy or trisomy can a) Normal X chromosome segregation b) Nondisjunction in meiosis I c) Nondisjunction in meiosis II Diploid cell at start of meiosis First meiotic division Nondisjunction Second meiotic division Nondisjunction 00 00 develop. Benjamim XCuinmi х Х х х Xх хх о о XX O 2. A color-blind man married a normal woman. Their daughter, who was phenotypically normal, married a normal man and the couple produced three children, a normal boy, a color-blind boy, and a color-blind girl. Further examination indicates that this girl has two X chromosomes. Explain the origin of the color- blind girl.A) Hoe many cells are produced by the end of meiosis II? B) Are the cells produced at the end of meiosis II haploid or diploid? C) Are the chromosomes of the four final meiotic products replicated or nonreplicated?Prophase Metaphase Anaphase Telophase