Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 46, Problem 11TYU
SCIENTIFIC INQUIRY You discover a new egg-laying worm speties. You dlssect four adults and find both oocytes and sperm in each. Cells outside the gonad contain five chromosome pairs. Lacking genetie variants, explain how you would determine whether the worms can self-feriilize.
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Time (hours) # of cells
1
2
64
10,000
30,000
80,000
170,000
106
0
½
4
6
10
19
32
110
Notes
Egg is fertilized
First cleavage
Polarization
Blastula
Gastrula
Neurula
Somite formation
Feeding tadpole
a) How many cell divisions took place in the first 4 hours?
i) 0
ii) 2
iv) 6
iii) 4
b) How many cells exist after 12 cycles (12 cell divisions)?
i) 2
ii) 64
iii) 4096
iv) 10,000
c) Using your graph, which of the seven time intervals has the most rapid rate of cell
division (increase in the number of cells in a time interval? [HINT: On the graph, the
rate is higher if the slope is steeper.]
0 to 12 hours
ii) 4 to 6 hours
v) 8
iii) 10 to 19 hours
iv) 32 to 110 hours
3) In the human brain, an estimated average rate of 250,000 nerve cells are produced each
minute during gestation and through 6 months after birth.
a) How many nerve cells are in a healthy 6-month-old human brain?
i) 1.62 x 108 nerve cells ii) 1.62 x 10¹¹ nerve cells
iii) 1.62 x 10¹4 nerve cells
4) One of the earliest stages of…
1: Make a diagram of the life cycle of a diagenetic fluke worm (Class Trematoda).
2: Highlight the stage(s) of life cycle that reproduce sexually and which are capable of asexual reproduction.
3: Explain the advantages of having a life cycle with both sexual and asexual phases.
Fertilized egg
What structure tells you what stage this is?
Blastocoel
O Visible nucleus
O Archenteron
Blastopore
O Fertilization envelope
Chapter 46 Solutions
Campbell Biology
Ch. 46.1 - Compare and contrast the outcomes of asexual and...Ch. 46.1 - Parthenogenesis is the most common form of asexual...Ch. 46.1 - WHAT IF? If a hermaphrodite self-fertilizes, will...Ch. 46.1 - Prob. 4CCCh. 46.2 - How does internal fertilization facilitate life on...Ch. 46.2 - What mechanisms have evolved in animals with (a)...Ch. 46.2 - MAKE CONNECTIONS What are the shared and distinct...Ch. 46.3 - Why might frequent use of a hot tub make it harder...Ch. 46.3 - Prob. 2CCCh. 46.3 - WHAT IF? If each vas deferens in a male was...
Ch. 46.4 - How are the functions of FSH and LH in females and...Ch. 46.4 - How does an estrous cycle differ from a menstrual...Ch. 46.4 - WHAT IF? If a human female begins taking...Ch. 46.4 - Prob. 4CCCh. 46.5 - Prob. 1CCCh. 46.5 - In what ways are tubal ligation and vasectomy...Ch. 46.5 - Prob. 3CCCh. 46 - Would a pair of haploid offspring produced by...Ch. 46 - Identify which of the following, if any, are...Ch. 46 - How does the difference in size and cellular...Ch. 46 - Prob. 46.4CRCh. 46 - Prob. 46.5CRCh. 46 - Prob. 1TYUCh. 46 - In male mammals, excretory and reproductive...Ch. 46 - Prob. 3TYUCh. 46 - Prob. 4TYUCh. 46 - Prob. 5TYUCh. 46 - Prob. 6TYUCh. 46 - Prob. 7TYUCh. 46 - Prob. 8TYUCh. 46 - DRAW IT In human spermatogenesis, mitosis of a...Ch. 46 - Prob. 10TYUCh. 46 - SCIENTIFIC INQUIRY You discover a new egg-laying...Ch. 46 - WRITE ABOUT A THEME: ENERGY AND MATTER In a short...Ch. 46 - SYNTHESIZE YOUR KNOWLEDGE A female Komodo dragon...
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- Meiosis ________. a. occurs only in germ cells of animals b. supports growth and tissue repair in multicelled species c. gives rise to genetic diversity among offspring d. is part of the life cycle of all cells.arrow_forwardWhich of the following follows fertilization in Xenopus embryos? Calcium waves cause non-yolky cytoplasm to squeeze into animal pole Meiosis II completes Occurs before albumen and shell are secreted to cover the egg Cortical rotation Centrally located yolk confines cleavage to cytoplasmic rim of eggarrow_forwardNotice that the size of the scale bar is 50 um. Keeping this image available, watch the șsea 4. Finding the size of a sea urchin embryo Observe the image of the sea urchin embryo. 50μm Photo credit. urchin embryo cell division movie Calculate the diameter of a sea urchin embryo at he one-, two-, and four-cell stages, Show your calculations below. If that video doesn't play (it unfortunately requires Flash), you can try this similar but longer one that involves a longer story of sea urchin romance preceding fertilization and zygote divisions! It lacks a scale bar, but you can use the scale bar from the image above. https://www.youtube.com/watch?v3D4445zftlCDQ a. One cell-your calculations: b. Two cells-your calculations: c. Four cells-your calculations:arrow_forward
- Briefly compare and contrasts the advantage of asexual and sexual reproduction. Which one is most common in animals?arrow_forwardIn questions 13 and 14, decide whether each is an example of sexual or asexual reproduction, and state why. 13. A diploid queen honeybee produces haploid eggs by meiosis. Some of these eggs are never fertilized and develop into haploid male honeybees (drones).arrow_forwardMind map about asexual and sexual reproduction of animalsarrow_forward
- Match each hypothesis to its theory. Preformationism Genetic information is inherited from one parent or the other, not both. Pangenesis concept Reproductive cells have complete genetic codes for their species. Germ-plasm theory Cells in different tissues have unique genetic codes that are transferred to the gonads to produce gametes.arrow_forwardIt asks to use the development images below to identify one of each of the following in the photos: Zygote -Morula 2-celled stage -Blastula 8-celled stage -Gastrulaarrow_forwardOrder the events leading to the sperm's nucleus fusing with the egg's nucleus. Question 1 options: sperm's nucleus is released into the egg's cytoplasm sperm burrows through the orona radiata sperm's nucleus and egg's nucleus fuse sperm's cell memrbane fuses with egg's cell membrane sperm's acrosome enzymes burrows through the zona pellucida the zona pellucida changes so that any new sperm's acrosome cannot burrow through the zona pellucidaarrow_forward
- The mode of Caenorhabditis elegans nematode sex determination is based on ________. XX and XY chromosomes for females and males, respectively. XX and XO for females and males, respectively. XO and YY chromosomes for females and males, respectively. ZW and ZZ for females and males, respectively. XX and XO chromosomes for hermaphrodites and males, respectively.arrow_forwardMature Medusa 1. Look at the life cycle diagram of a jellyfish species on the right. Immature Medusa a) Indicate which type of reproduction (asexual or sexual) takes place at each of the four stages indicated on the diagram. Explain how you can tell. Fertilised Egg 4 1 Blastula b) What are the advantages of having Medusa Planula - Bud Larva both asexual and sexual reproductive capabilities? c) Under which circumstances do many organisms, such as rotifers and single-celled plankton, switch from asexual to sexual 3 Colony Polyp Bud Polyp reproduction? Why? Frustule Bud Frustule Larvaarrow_forward8. The major event in the embryonic development of animals that results in a layered embryo is called Group of answer choices choanoflagellation transmogrification ecdysis compartmentalization desagellation gastrulation gelatinization cephalizationarrow_forward
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Embryology | Fertilization, Cleavage, Blastulation; Author: Ninja Nerd;https://www.youtube.com/watch?v=8-KF0rnhKTU;License: Standard YouTube License, CC-BY