2. Explain one way each of the following can occur. In your answer, say whether nondisjunction occurs in the father or mother and whether it occurs in the first or second division. There may be more than one possible way for these errors to occur, you only need to list one way. XXY YO (An embryo with no X chromosome, but has a Y chromosome) They will not survive)

2. Explain one way each of the following can occur. In your answer, say whether nondisjunction occurs in the father or mother and whether it occurs in the first or second division. There may be more than one possible way for these errors to occur, you only need to list one way. XXY YO (An embryo with no X chromosome, but has a Y chromosome) They will not survive)

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter14: Chromosomes And Human Inheritance

Section: Chapter Questions

Problem 3GP: Human females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With...

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14. Label the phases of Meiosis and annotate any important events or features. 9--0-
IV. 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?
Instructions Explain 1 way each of the following can occur. In your answer, say whether non- disjunction occurs in the father or mother and whether it occurs in the first or second division. There may be more than one possible way for these errors to occur, you only need to list one way. XXY YO (An embryo with no X chromosome, but has a Y chromosome) They will not survive)
8. Identify the following. Gene found on Y chromosome but not X chromosomes Protein coded for by SRY gene Function of testis determining factor (TDF) Organ that secretes testosterone and Mullerian inhibiting factor (MIF) Hormone that promotes development of external genitalia along male line Protein that transforms Wolffian ducts into male reproductive tract organs Organ that develops in the absence of TDF SRY gene sex-determining region Y protein initiating male sex determination Testosterone
1.Determine the possible kinds of gametes each parent could be produced by: Jane (mother): Tt XcXc IBi -Taster, Color-blind female, Blood type A John (father): tt XcY IAIB- Non-taster, Color-blind male, Blood type AB 2. What percentage of your children would you expect to be boys? Girls?
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6. What is the probability that an egg bearing a Y- chromosome be fertilized by a sperm carrying an X-chromosome? O 1/8 O 1/4 0 0 01/2 0 1
32. Disorders in chromosome number, or aneuploidies, are typically lethal to the embryo. O True O False
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is it ok to take early testing of chromosome defects in pregnancy, both sides of the issue