Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 42, Problem 5FIB
Summary Introduction

Introduction:

The female reproductive system mainly consists of the ovaries, uterus, and vagina. The egg cell formation occurs in the ovaries, the process is called oogenesis. The eggs enters into the uterine tube, where the fusion of sperm and egg occurs, this process is called as fertilization. After fertilization, the early embryo implants in the lining of uterus, where development continues. The vagina receives the sperm and serves as the birth canal.

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Spermatogenesis usually occurs during the ___________ and continues in the _________ stage in some insects. The _________ is composed of germ cells and somatic mesodermal cells. Each follicle contains a large _________ that apparently serves as trophic function. The spermatogonia undergo several __________ divisions to form the primary spermatocytes.  The primary spermatocytes become _________ in somatic cells.  The primary spermatocytes undergo _________ and produce haploid daughter cells in the next region.  In the zone of maturation and reduction, the primary spermatocytes become _______ and _________ respectively. 10.The secondary spermatocytes become transformed into ____________.  When the _________ in which they have been encased throughout spermatogenesis rupture, 12.the spermatozoa enter the vas efferens and the vas deferens and lodge in the _________. When the spermatozoa are released into the ducts, they remain in bundles known as _______ held together by a gelatinous…
Spermatogenesis usually occurs during the ___________ and continues in the _________ stage in some insects. The ________ is composed of germ cells and somatic mesodermal cells. Each follicle contains a large _________ that apparently serves as trophic function. The spermatogonia undergo several __________ divisions to form the primary spermatocytes. The primary spermatocytes become _________ in somatic cells.
In asexual reproduction only ______  ______________is involved, and the offspring are genetically _____________________to the parent. – In Unchanging environments In sexual reproduction _______ _________________are involved, and the offspring are genetically ___________________from the parent. – Changing environments Evolution is _____________  _____________over time in a ________________________. Different organisms have different genes. How is it that so many organisms seem perfectly suited to their environment? ___________  _____   ___________________. After a genetic __________or mutation in an organism, It survives, reproduces, and passes along its genes. Beneficial ______________ develop at random. The environment “___________” beneficial adaptations. Adaptations are an inherited characteristic.
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