WHAT IS LIFE? A GUIDE TO BIO 3E+LAUNCHPA
3rd Edition
ISBN: 9781319103316
Author: PHELAN
Publisher: Macmillan Higher Education
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Chapter 6, Problem 16SA
Summary Introduction
To analyze:
Why within a species, if one sex (i.e., males or females) has two different sex chromosomes while the other has two of the same chromosomes, which of these sexes will determine the sex of any offspring they have together? Why?
Introduction:
In human reproductive cycle when the sperm and egg combine, the sex of a baby is determined by the father’s gamete. In the turn of events ultimate determination of sex is decided by one special pair of chromosomes, the sex chromosomes, which carry information that directs a growing fetus to develop as a male or as a female.
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Chapter 6 Solutions
WHAT IS LIFE? A GUIDE TO BIO 3E+LAUNCHPA
Ch. 6 - Prob. 1SACh. 6 - Prob. 2SACh. 6 - Prob. 3SACh. 6 - Prob. 4SACh. 6 - Prob. 5SACh. 6 - Prob. 6SACh. 6 - Prob. 7SACh. 6 - Prob. 8SACh. 6 - Prob. 9SACh. 6 - Prob. 10SA
Ch. 6 - Prob. 11SACh. 6 - Prob. 12SACh. 6 - Prob. 13SACh. 6 - Prob. 14SACh. 6 - Prob. 15SACh. 6 - Prob. 16SACh. 6 - Prob. 17SACh. 6 - Prob. 1MCCh. 6 - Prob. 2MCCh. 6 - Prob. 3MCCh. 6 - Prob. 4MCCh. 6 - Prob. 5MCCh. 6 - Prob. 6MCCh. 6 - Prob. 7MCCh. 6 - Prob. 8MCCh. 6 - Prob. 9MCCh. 6 - Prob. 10MCCh. 6 - Prob. 11MCCh. 6 - Prob. 12MCCh. 6 - Prob. 13MCCh. 6 - Prob. 14MCCh. 6 - Prob. 15MCCh. 6 - Prob. 16MCCh. 6 - Prob. 17MC
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- One of the advantages of sexual reproduction is that it promotes genetic diversity in the offspring. This is because gametes are produced by meiosis, which introduces genetic variation into the resulting gametes. How does meiosis accomplish this? Describe one way (there are several choices) in which meiosis produces new combinations of genes in gametes.arrow_forwardE 0 Listen Match the image to the stage. Black is paternal, white is maternal ... < -19 Listen Meiosis 1 Meiosis 2 Mitosis G2 Sisters separate Spindle forms 1. Crossing Over Occurs 2. Chromosomes become less distinct, nuclear envelope reforms. Chromosomes Duplicate 3. First Cell Division Occurs lolH HH A single line of chromosomes appears in the middle of the cell 11 F Put the following in order in mitosis and the preceding interphase Hint: Determine whether the event occurs in G1, S, G2, prophase, metaphase, anaphase, telophase or cytokinesis first. Also draw the stages out. d b B d F d b Put the following steps in order during meiosis and the previous interphase. Hint: Determine which step (interphase, Meiosis 1 and Meiosis 2) they occur in and then which phase (prophase, metaphase, anaphase, telophase, cytokinesis). Also draw the stages out. B darrow_forwardIn mammals, there are two sex chromosomes, X and Y, which behave like homologous chromosomes during meiosis. Normal males have one X chromosome and one Y chromosome, and normal females have two X chromosomes. Males with an extra Y chromosome (XYY) occasionally are found due to inappropriate segregation of the chromosomes (i.e. non-disjunction). Which of the following could give rise to such an XYY male? Answer Yes or No for each situation. nondisjunction in the first meiotic division of spermatogenesis; normal meiosis in the mother nondisjunction in the second meiotic division of spermatogenesis; normal meiosis in the mother nondisjunction in the first meiotic division of oogenesis; normal meiosis in the father nondisjunction in the second meiotic division of oogenesis; normal meiosis in the fatherarrow_forward
- What determines whether a gamete is male or female? Explain why this difference predicts the two main forms of sexual selection.arrow_forwardHow does meiosis maintain the number of chromosomes in a sexually reproducing species?arrow_forwardWhy is meiosis necessary for sexual recombinations?arrow_forward
- For part c, do they consider the total sex chromosomes to be 2 or 3?arrow_forwardIf a diploid cell entering meiosis has 12 chromosome pairs, what is the number of possible chromosomes at the end of meiosis?arrow_forwardDuring meiosis in male mammals, sex chromosomes segregate to produce two types of sperm: X‑bearing sperm and Y‑bearing sperm. True or false?arrow_forward
- Which statement does not accurately describe what occurs during the process of meiosis? A) All stages of meiosis follow DNA replication. B) Meiosis produces gametes with the haploid chromosome number. C) Meiosis produces four identical gametes, either egg or sperm. D) Genetic variation among sexually reproducing organisms is enhanced by meiosis. Not Gradedarrow_forward2) Meiosis and sexual reproduction are, in large part, responsible for genetic variation within a population. Meiosis supports genetic variation in several ways. All BUT ONE applies to meiosis, sexual reproduction and genetic variation. A) Meiosis is preceded by DNA replication of chromosomes in the nucleus of the mother cell. B) As seen in the diagram, during meiosis crossing over, or swapping of DNA segments, may occur. C) During fertilization each parent randomly contributes a unique set of chromosomes to the zygote. D) Because of recombination and independent assortment during meiosis, each of the four gametes contains a different set of DNA. Not Gradedarrow_forwardConsider a species of wasp in which females are diploid and come from fertilized eggs, while males are haploid and come from unfertilized eggs. Assuming that a queen mates with only one male, determine the coefficient of relationship (r) for each of the following. a)A female (worker) to her sister: b)A female (worker) to her brother: c)A female (worker) to her fatherarrow_forward
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