Biological Science (7th Edition)
7th Edition
ISBN: 9780134678320
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 12, Problem 10TYPSS
Summary Introduction
To review:
When a fruit fly embryo first begins to develop, a large cell is generated that contains over 8,000 genetically identical nuclei. Explain the reason responsible for this result.
Introduction:
Cell cycle is the sequence of events that occurs in the cell for replication and division of chromosomes to produce two identical daughter cells with equally divided genetic material. Cytokinesis is a part of cell division where cytoplasm of the cell is divided into two daughter cells.
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The diagram below shows a cell during Meiosis II:
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
Human cells normally have 46 chromosomes. For each of the following stages, state the number of chromosomes present in the particular cell.a) metaphase of mitosisb) metaphase I of meiosis
c) telophase of mitosisd) telophase I of meiosis
e) telophase II of meiosis
(Remember that a pair of attached chromatids count as one chromosome.)
One reason that worker bees forgo their own reproduction to help their sister (the queen) reproduce is that female bees are more closely related to their sisters than they are to their own offspring. This quirk of genetics results from the fact that bees have haplodiploid sex determination, in which females are diploid, with a mother and a father, but males are haploid, developing from unfertilized eggs. Because males are haploid, they produce sperm by mitosis. Explainwhy haplodiploid sex determination causes females to be more closely related to their sisters than to their offspring.
Chapter 12 Solutions
Biological Science (7th Edition)
Ch. 12 - 1. Which statement about the daughter cells...Ch. 12 - After S phase, what comprises a single chromosome?...Ch. 12 - Progression through the cell cycle is regulated by...Ch. 12 - 4. What major events occur during anaphase of...Ch. 12 - 5. Identify at least two events in the cell cycle...Ch. 12 - 6. What evidence suggests that during anaphase,...Ch. 12 - 7. Evaluate each of the following defects. Which...Ch. 12 - Prob. 8TYUCh. 12 - Prob. 9TYPSSCh. 12 - Prob. 10TYPSS
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- In meiosis, each centromere has a spindle fiber attached only to one side. In mitosis, each centromere has a spindle attached to how many sides?arrow_forward1). A diploid somatic cell from a dog (Canis lupus familiaris) has a total of 78 chromosomes (2n = 78). As in humans, sex chromosomes determine sex: XX in females and XY in males. a) What is the total number of DNA molecules in G2 of the cell cycle? b) What is the total number of sister chromatids during prometaphase? c) What is the total number of telomeres in a somatic dog cell in G1? d) What is the total number of autosomes?arrow_forward44) Pick the answer that best describes how metaphase I and metaphase II differ from each other. A) Metaphase I lines up homologous chromosomes on the metaphase plate while metaphase II lines up sister chromatids. B) Metaphase I is a haploid stage while metaphase II is a diploid stage C) Metaphase I lines up sister chromatids on the metaphase plate while metaphase II lines up homologous chromosomes. D) Metaphase I is a diploid stage while metaphase II is a haploid stage E) A&Darrow_forward
- In a turtle species, a diploid cell in the G1 phase of the cell cycle contains 22 picograms of DNA (picogram is a measure of the total mass of the DNA present). How much DNA is present in a cell of the same species at prophase II of meiosis (prophase of the second meiotic division)?arrow_forwardDomesticated sheep cells have a total of 54 chromosomes (versus 46 chromosomes in human cells). (a) How many separate DNA molecules are present in a sheep liver cell at the end of the G1 phase? (b) How many separate DNA molecules are present in the daughter cells after meiosis I in the ovary of the sheep? (c) How many separate DNA molecules are present in the daughter cells after meiosis II in the ovary of the sheep?arrow_forwardHuman cells normally have 46 chromosomes. For each of the following stages, state the number of chromosomes and the number of DNA molecules found in these chromosomes that are present in a human cell. a) Metaphase of mitosis Metaphase I of meiosis c) Telophase of mitosis (after cytokinesis)arrow_forward
- Overall, meiosis and mitosis are analogous processes involving many of the same proteins. However, some proteins function uniquely in each of these cell-division events. Explain the meiosis-specific function of the following: (a) Ime2, (b) Rec8, (c) monopolin.arrow_forwardAt what stage of mitosis can the kind and number of chromosomes be easily detected and determined? How does non disjunction in meiosis lead to numerical chromosomal aberration? If cell division during gametogenesis is non meoitic, what is its consequence to the future generations of diploid organisms? What is the relationship between meiosis and fertilization?arrow_forwardHomologous chromosomes a) are formed when the chromosomes separated during anaphase b) are matching set of chromosomes that a cell receives from both parents c) carry the same alleles in the same sequence d) are a set of identical alleles that a cell receives from both parentsarrow_forward
- There are 40 chromosomes in somatic cells of the house mouse. (a) How many chromosomes does a mouse receives from its father? (b) How many autosomes are present in a mouse gamete? (c) How many sex chromosomes are in a mouse ovum? (d) How many autosomes are in somatic cells of a female?arrow_forwardIdentify the stage of meiosis diploid cells of this species have 3 homologous pairs of chromosomes a b and ca) prophase b) telophase c) anaphase d) prophase 2 e) telophase 2Activation of the adrenal cortex produce androgens is called adrenarche ? True/falseHow does photosynthesis relate to cellular aerobic respiration?arrow_forwardWhat molecular mechanism seems to be responsible for the movement of the poles during anaphase?arrow_forward
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