a) Consider the situation described below Set-up Individual A: Chromosomal Male 1_Normal disjunction of all chromosomes in Meiosis 1 2_Nondisjunction of sex chromosomes in Meiosis 2 Individual B: Chromosomal Female 1_Normal disjunction of all chromosomes in Meiosis 1 2_Normal disjunction of all chromosomes in Meiosis 2 Note: Assume that all gametes and zygotes are viable Is there a chance that individuals A and B will have a child with Klinefelter syndrome (XXY)? Yes/No Because b) How would you represent the chromosome constitution of an allohexaploid? Please explain briefly because c) Do you anticipate that the offspring of a diploid grape plant and a tetraploid grape plant will be fertile? Yes/No because

a) Consider the situation described below Set-up Individual A: Chromosomal Male 1_Normal disjunction of all chromosomes in Meiosis 1 2_Nondisjunction of sex chromosomes in Meiosis 2 Individual B: Chromosomal Female 1_Normal disjunction of all chromosomes in Meiosis 1 2_Normal disjunction of all chromosomes in Meiosis 2 Note: Assume that all gametes and zygotes are viable Is there a chance that individuals A and B will have a child with Klinefelter syndrome (XXY)? Yes/No Because b) How would you represent the chromosome constitution of an allohexaploid? Please explain briefly because c) Do you anticipate that the offspring of a diploid grape plant and a tetraploid grape plant will be fertile? Yes/No because

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter20: The Reproductive System

Section: Chapter Questions

Problem 11RE

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Identify the stages of meiosis described by the following meiotic events/conditions/terms. Write prophase I, metaphase I, anaphase I, telophase I, prophase II, metaphase II, anaphase II, or telophase II. In case the events are found in both stages, write the stages both. 1. Formation of chiasma 2. Each chromatid is considered as full-fledged chromosome. 3. Chromosomes begin to pair off. 4. Spindle microtubules start to attach to the centromere. 5. Tetrads are aligned at the middle of the cell. 6. The sister chromatids separate. 7. Produce 2 haploid daughter cells. 8. The chromosomes line up at the middle of the cell. 9. The sister chromatids move together to the opposite poles. 10. The chromatids reach the poles. 11. The chromosomes in each daughter cell are still duplicated.12. Spindle microtubules attach in the centromere of each haploid daughter cell. 13.
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.
Briefly describe nondisjunction in meiosis and identify several potential consequences. In other words, what are the possible outcomes?
a. If cell division during gametogenesis is non-meiotic, what is its consequence to the future generations of diploid organisms? b. How does non-disjunction in meiosis lead to numerical chromosomal aberration?
Fill in the cells below showing the process of meiosis of the male's sex chromosomes with non- disjunction occurring during meiosis I. DO NOT show crossing over. Prior to meiosis 44 +XY What are the possible abnormal gametes the male can produce with non-disjunction occuring in Meiosis I? Identify the possible sexual aneuploidy syndrome if these abnormal sperm cells are fertilized by a normal egg cell. Could this man father a Tuner syndrome (XO) child? Could this man father a Klinefelter's syndrome child (XXY)?
B.If the diploid human chromosome number (2n) =46, what will be the chromosome number per cell in each stage of meiosis if nondisjunction of a pair of chromosomes happened during anaphase II of Meiosis II
Explain the process of the following: a. The normal segregation of chromosomes during Meiosis 1 and Meiosis 2 in MALE. b. The abnormal segregation of chromosomes during Meiosis 1 and Meiosis 2 in FEMALE.
Fill in the cells below showing the process of meiosis of the male's sex chromosomes with non- disjunction occuring during meiosis II. DO NOT show crossing over. Prior to meiosis 44 +XY What are the possible abnormal gametes the male can produce with non-disjunction occurring in Meiosis II? Identify the possible sexual aneuploidy syndrome if these abnormal sperm cells are fertilized by a normal egg cell. Could this man father a Tuner syndrome (XO) child? Could this man father a Klinefelter's syndrome child (XXY)?
EXAMPLE 2: The parents in the family above produce another son, this time with two Y chromosomes and normal tooth enamel. In which parent did the nondisjunction occur? Explain and/or illustrate. Did nondisjunction occur at meiosis I or II? Explain and/or illustrate. What sex chromosomes are in the child’s somatic cells? This was not answered
14. Label the phases of Meiosis and annotate any important events or features. 9--0-
In During anaphase I of meiosis I:
3) For each cell below, identify the meiosis phase (meiosis I or II) and stage of meiosis it is in (or if it is in interphase).