Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 42.1, Problem 1TC
Summary Introduction
To determine:
The reason why natural selection favor aphids that alternate between asexual and sexual reproduction at different seasons of the year.
Introduction:
Aphids are the tiny sap-sucking insects belong to the superfamily Aphidoidea. These are distributed worldwide, but are commonly found in the temperate region. They have soft bodies which may be black, green, pink and brown in color. They can be alternate between asexual and sexual mode of reproduction within the same host at different seasons of the year.
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After plasmogamy has occurred, many molds (Mucoromycetes) exist in a heterokaryotic stage for up to centuries at a time. What occurs at the immediate end of this stage?
The nuclei fuse in a process called karyogamy.
The hyphae fuse in a process called karyogamy.
Diploid spores are produced in various spore-producing structures.
A haploid zygote is formed that becomes multicellular through repeated rounds of mitosis.
In embryophytes, especially spermatophya, what is the difference between a "sporocyte" (e.g., megasporocyte) and the actual spore (e.g., megaspore)?
a) Meiosis: Megasporocyte is still diploid, megaspore haploid
b) Mitosis, number of nuclei: Megaspore has eight cell nuclei, megasporocyte only one
c) Cytokinesis: Megasporocyte has only one cell, Megaspore can have several (as endosporic gametophyte).
d) None: the two terms are synonymous.
e) Meiosis: Megaspore is still diploid, megasporocyte haploid
Differentiate between Phylum Porifera and Clade Eumetazoa.
A)Poriferans are only haploid during their life cycle, whereas eumetazoans are diploid with haploid sex cells at various stages of their life cycle.
B)Poriferans have mobile gametes while eumetazoans do not.
C)Poriferans invert during their development whereas eumetazoans do not invert at any time during their life cycle.
D)The various cells types of Poriferans do not form permanent associations into true tissues during their life cycle, whereas Eumetazoa possess true, stable tissues.
E)Poriferans have only one kind of cell during their life cycle whereas Eumetazoa have many kinds of cells throughout their life cycle.
Chapter 42 Solutions
Biology
Ch. 42.1 - Prob. 1TCCh. 42.1 - Prob. 2TCCh. 42.1 - Prob. 1CSCCh. 42.1 - Prob. 1CYLCh. 42.1 - Prob. 2CYLCh. 42.1 - Prob. 3CYLCh. 42.2 - Mammalian sperm dont live very long after...Ch. 42.2 - Prob. 1TCCh. 42.2 - Prob. 1HYEWCh. 42.2 - describe the human male and female reproductive...
Ch. 42.2 - explain how hormonal interactons control...Ch. 42.2 - describe spermatogenesis and oogenesis, the...Ch. 42.3 - In 2017, scientists used CRISPR Cas9 DNA editing...Ch. 42.3 - describe the principal methods of contraception,...Ch. 42.3 - Prob. 2CTCh. 42 - In humans, sperm are produced in the a....Ch. 42 - In humans, fertilization usually occurs in the a....Ch. 42 - Prob. 3MCCh. 42 - Prob. 4MCCh. 42 - Prob. 5MCCh. 42 - Reproduction by a single animal, without the need...Ch. 42 - In mammals, the male gonad is called...Ch. 42 - Prob. 3FIBCh. 42 - Prob. 4FIBCh. 42 - Prob. 5FIBCh. 42 - Oocytes develop in a multicellular structure, the...Ch. 42 - Describe the advantages and disadvantages of...Ch. 42 - Compare the structures of the egg and sperm. What...Ch. 42 - Prob. 3RQCh. 42 - List the structures, in order, through which a...Ch. 42 - Name the three accessory glands of the male...Ch. 42 - Prob. 6RQCh. 42 - Prob. 1AC
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