sometimes things happen like if the mommy drinks alcohol or does drugs it can have a big negative effect on the babe. The average length of time for prenatal growth to complete is 40 weeks from the date of conception. During this time‚ a single-celled zygote grows in a chain of stages into a full-term baby. The three main stages of prenatal growth are the germinal stage‚ the embryonic stage‚ and the fetal stage. The embryonic stage initiates after implantation and lasts until eight weeks after conception
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abortions actually do by standing for etching of the embryo before birth. They ignore the fact that the baby is already a human being‚ from the very first days after conceiving. According to W. L. Saunders‚ “Every human being begins as a single-cell zygote‚ grows through the embryonic stage‚ then the fetal stage‚ is born and develops through infancy‚ through childhood‚ and through adulthood‚ until death. Each human being is genetically the same human being at every stage‚ despite changes in his or her
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An adult hermaphrodite of C. elegans has the lesser amount of internal tissues and organs with unsegmented‚ bilaterally symmetrical‚ a cylinder-shaped body that is pointed at the ends. It has an outer covering (i.e.‚ body wall made up of cuticle‚ hypodermis‚ neurons‚ muscles and excretory and an inner tube contains the pharynx‚ intestine. An outer tube and an inner tube is partitioned by pseudocoelomic space and also the tissues controlled by an osmoregulatory system. In C.elegans head‚ the pharynx
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P1: Explain how sperm and ova are formed by producing an annotated diagram of meiosis and discussing what happens in ogenesis and spermatogenesis In the male‚ meiosis precedes sex cell differentiation. A single spermatogonium enters the first meiotic division as a primary spermatocyte. This division produces two secondary spermatocytes‚ each of which divides to form two haploid spermatids. Each spermatid then differentiates (by a process called spermiogenesis) into a spermatozoon by the elaboration
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1) What are the technical challenges for cloning a mammal organism? Include the following terms in your answer: cell determination‚ cell differentiation‚ and nuclear reprogramming. Cloning is producing a cell line or culture all whose members contain identical copies of a particular nucleotide sequence; an essential element in genetic engineering (Raven et al‚ G-5). Lack of imprinting; genes that are imprinted are expressed differently‚ the original parent in which the gene was taken from is the
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Week 16 – Reproductive System Study Guide 1) Identify the characteristics and functions of the following: penis‚ testes‚ seminal vesicles‚ prostate gland‚ sperm Penis- external sexual organ of male humans Testes-produce the male reproductive cell Seminal vesicles- secrete seminal fluid and nourish and promote the movement of sperm Prostate gland-controls the release of urine from the bladder Sperm- male reproductive cell 2) Identify the characteristics
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INTRODUCTION Levels of organization (cell to biosphere) and characteristics of life Levels: Cells->tissue ->organs & organ systems->organisms->populations->communities->ecosystems-> biosphere Characteristics of life: Cell and Organization: Each cell can only do the job it is tasked with. Example: brain cells Energy Use and Metabolism: Energy is needed many organisms. Energy is utilized in chemical reactions Response to Environmental Changes: responds to stimuli Regulation and Homeostasis: ex:
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Why Abortion is Not Impermissible The legal status of abortion is regarded as one of the most long disputed and controversial ethical issues in the world of politics‚ presumably because of the moral dilemmas that it is thought to present. Many of those who oppose of the right to abort may do so from a theistic standpoint‚ which leads to more debates regarding the separation between church and state. But abortion is not something that should be forbidden by law. All adult human beings have the right
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that maintains respect for human life. The IVF process involves monitoring and stimulating a woman’s ovulatory process‚ in which you remove an ovum (egg) from the ovaries and let the sperm fertilize in a liquid in a laboratory. The fertilized egg (zygote) is cultured for two to six days in a growth medium and then implanted into the woman’s uterus‚ with the intention of establishing a successful pregnancy. Even though there
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there is an alternation of generations; the gametophyte generation‚ where haploid gametes (pollen and ovule; sperm and egg) are produced via mitosis. Then the sporophyte generation combines these two into spores via meiosis‚ resulting in a diploid zygote which can grow into new cells. 2. Describe the sun as the ultimate source of energy for life? Plants undergo the process of photosynthesis‚ where they absorb light energy and convert it into sugar. This process expels oxygen‚ which all living
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