BIOLOGY CONNECT ACCESS CARD 1-SEMESTER
12th Edition
ISBN: 9781264019090
Author: Raven
Publisher: MCG/CREATE
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Chapter 11, Problem 4S
Aneuploid gametes are cells that contain the wrong number of chromosomes. Aneuploidy occurs as a result of nondisjunction, or lack of separation of the chromosomes during either phase of meiosis.
a. At what point in meiotic cell division would nondisjunction occur?
b. Imagine a cell had a diploid chromosome number of four. Create a diagram to illustrate the effects of nondisjunction of one pair of homologous chromosomes in meiosis I versus meiosis II.
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Chapter 11 Solutions
BIOLOGY CONNECT ACCESS CARD 1-SEMESTER
Ch. 11.1 - Prob. 1LOCh. 11.1 - Prob. 2LOCh. 11.2 - Describe how homologous chromosomes pair during...Ch. 11.2 - Prob. 2LOCh. 11.3 - Prob. 1LOCh. 11.3 - Prob. 2LOCh. 11.3 - Prob. 3LOCh. 11.4 - Prob. 1LOCh. 11.4 - Prob. 2LOCh. 11.4 - Explain the importance of the suppression of...
Ch. 11 - Prob. 1IQCh. 11 - In comparing somatic cells and gametes, somatic...Ch. 11 - What are homologous chromosomes? a. The two halves...Ch. 11 - Chiasmata form a. between homologous chromosomes....Ch. 11 - Crossing over involves each of the following with...Ch. 11 - During anaphase I a. sister chromatids separate...Ch. 11 - At metaphase I the kinetochores of sister...Ch. 11 - What occurs during anaphase of meiosis II? a. The...Ch. 11 - Which of the following does NOT contribute to...Ch. 11 - How does DNA replication differ between mitosis...Ch. 11 - Which of the following is NOT a distinct feature...Ch. 11 - Which phase of meiosis I is most similar to the...Ch. 11 - Structurally, meiotic cohesins have different...Ch. 11 - Prob. 6ACh. 11 - Diagram the process of meiosis for an imaginary...Ch. 11 - Mules are the offspring of the mating of a horse...Ch. 11 - Compare the processes of independent assortment...Ch. 11 - Aneuploid gametes are cells that contain the wrong...
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- imagine a giraffe whose diploid is 30. A)Under what circumstances would the giraffe go through a process of meiosis? . b) what will be the final result of this meiosis for the giraffe (# of cells + # of chromosomes/cells)arrow_forwarda) In which stage of mitosis do chromosomes condense? (b) If a eukaryotic organism has a total of 34 chromosomes, how many pairs will the chromosomes be arranged in? (c) Define homologous chromosomes.arrow_forwarda. What type of cell division mitosis, meiosis I or meiosis II is shown in this figure? b. What is the diploid number of this organism? c. Provide labels for (i) and (ii)arrow_forward
- a. What phase of Meiosis II is the cell in? How do you know? b. Assuming all of the chromosomes present during Meiosis II are shown in the figure above, how many chromosomes (counting homologous pairs as two chromosomes) does a gamete from this organism have? c. Draw the same cell during the same phase of Meiosis I. Label the elements.arrow_forwardGive explanation X and Y chromosomes are not homologs, but in meiosis they do pair and segregate in XY organisms to create 50% haploid gametes with an X chromosome and 50% haploid gametes with a Y chromosome. How is pairing achieved? a. Since all other homologous chromosomes pair, the remaining two chromosomes pair by default. b Pairing proteins are capable of binding to different genes on the X and Y chromosomes, which allows them to pair. c. None of the statements is correct. d. They don't actually pair. Random segregation generally ensures the X and Y chromosomes separate. e.Pseudoautosomal regions that are homologous exist at the tips of both the X and Y chromosomes, and they allow pairing.arrow_forwardIn a zygote that begins with a complement of two homologous chromosomes pairs, A and a, and B and b: a. What chromosome compliments would you find in each somatic cells during growth? b. What combinations chromosomes would you expect to find in the gametes if the individual becomes an adult?arrow_forward
- In a zygote that begins with a complement of two homologous chromosomes pairs, A and a, and B and b: a.What chromosome compliments would you find in each somatic cells during growth? b.What combinations chromosomes would you expect to find in the gametes if the individual becomes an adult?arrow_forwardCould nondisjunction occur during mitosis? Compare and contrast the likely consequence of nondisjunction in mitosis vs. meiosis.arrow_forwardExplain mechanisms by which two homologous chromosomes are tied with each other in metaphase I (metaphase in the first meiosis) and by which this tie is lost at the onset of anaphase I (anaphase in the first meiosis). In your answer include an explanation of the mechanism by which sister chromatids are held together during anaphase I.arrow_forward
- 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?arrow_forwardDuring meiosis, cells undergo two rounds of nuclear and cell division, but only one round of DNA synthesis. Describe the main differences between anaphase of mitosis and anaphase I in meiosis. Why are these differences important for meiosis to occur correctly?arrow_forwardA diploid male organism has two homologous chromosomes. A and B are from its maternal parent, while A’ and B’ are from its paternal parent. Draw the chromosomes at the following stages: a, anaphase of mitosis b. anaphase of the first meiotic division c, anaphase of the second meiotic division If the same chromosomes were involved in meiosis in a female, would the kind of egg nuclei produced be different from the sperm nuclei? Why?arrow_forward
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