CUSTOM BIOLOGY
19th Edition
ISBN: 9781323945490
Author: Urry
Publisher: Pearson Custom Publishing
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Textbook Question
Chapter 46, Problem 46.2CR
Identify which of the following, if any, are unique to mammals: a female uterus, a male vas deferens, extended internal development, and parental care of newborns.
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Describe the biological basis for the 1 : 1 ratio of malesand females at conception in mammals.
Briefly discuss avian early embryonic development, starting with fertilization and oviposition, cleavage, gastrulation, and early organogenesis and morphogenesis in the developing avian embryo inside the egg.
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Chapter 46 Solutions
CUSTOM 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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- Define and describe the main features of the following developmental stages: fertilization, cleavage, gastrulation.arrow_forwardReproductive modes can be defined based on energetic provisioning (lechithotrophy vs. matritrophy) or birth style (ovipary vs. vivipary). Reproductive modes related to birth style mostly fall into clear categories of energetic provisioning. Define the above four reproductive modes based on energetics and style that make them distinct. Be sure to mention WHEN the relevant events related to each occur. Finally, explain why the birth style of ovovivipary less clearly falls into any one of these categories...arrow_forwardThis question is about mammals. a) What is the one defining characteristic that determines a mammal? b) Compare and contrast the three types of mammals with respect to fetal development and birth: the monotremes (such as the platypus), the marsupials (such as kangaroos), and the placentals (such as humans or dogs). That is, where does most of the early development occur, how is the young mammal introduced to the world, and how does the young obtain nourishment once introduced to the world?arrow_forward
- Which of the following rows correctly identifies a difference between blastocysts and morula? Select one: A. Blastocyst Morula Contains trophoblast and a zygote Contains 8 cells that are totipotent B. Blastocyst Morula Contains inner cell mass with germ layers Contains 8 cells that are totipotent C. Blastocyst Morula Contains trophoblast with germ layers Contains 16 cells that can become any cells in the human body D. Blastocyst Morula Contains trophoblast and inner cell mass Contains 16 cells that can become any cells in the human bodyarrow_forwardName the mammal who has shortest gestation period.arrow_forwardIt is the result of the union of human egg and sperm cell which initiates prenatal development. > embryo > zygote > morula > fetus > all of the abovearrow_forward
- During pregnancy, how does malnutrition during critical periods of development affect the fetus? Group of answer choices When the development of an organ is impaired, the damage is irreversible. If the development of the heart is impaired in the early stages, it can be reversed if good nutrition is provided after the critical period. Malnutrition does not affect the fetus but has adverse effects on the mother's health. Malnutrition does not cause dental problems as teeth develop after the baby is born. A surplus of nutrients taken after the critical period will make up for a deficit caused at any time during development.arrow_forwardExplain the developmental and functional similarities and differences between: 1. Avian yolk sacs and mammalian yolk sacs 2. Avian chorions and mammalian chorions 3. Avian allantois and mammalian allantoisarrow_forwardMatch the stage of gestation with the key development that occur during that timearrow_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