Female gametes are egg cells and male gametes are sperm cells. 2. When the sperm cell fuses with and fertilizes an egg cell‚ a zygote or fertilized egg forms. B. There are two divisions of meiosis known as meiosis I and meiosis II that occur‚ and each division has four stages: prophase‚ metaphase‚ anaphase‚ and telophase. II. I will now discuss the four stages of meiosis I. A. During
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Oogenensis Spermatogenesis Ovum (Haploid) Sperm (Haploid) This process is called fertilization Zygote (Dipliod) Sex cell produced in GONADES. Ovum: From the beginning of week-1 to the end of week-2 of gestation. Embryology: From the beginning of week-3 to the end of week-8 of gestation. Fetus: From the beginning of month-3 to the end
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ultimately gives rise to (one ovum‚ four ova) with the (haploid‚ diploid) number of chromosomes. 8. A spermatazoan is a (gamete‚ zygote)‚ and is (haploid‚ diploid). 9. An ovum is a (gamete‚ zygote)‚ and is (haploid‚ diploid). 10. When a spermatozoan and an ovum merge‚ they undergo the process of __fertilization____‚ and give rise to a (gamete‚ zygote)‚ which is (haploid‚ diploid). Questions 11-16. A hypothetical organism has 10 chromosomes for each of its body cells. 11.)
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Mitosis & Meiosis/ Human Development The Cell Cycle Stages of the Cell Cycle: G1 – cell growth S – DNA replication and continued cell growth G2 – Final preparations for division and continued cell growth M – Mitosis or cellular replication Some Important Terms for Replication: Chromosome – rod-shaped body in the nucleus that is only visible during replication that contains DNA and is our hereditary unit. Nucleolus – organelle inside the nucleus composed of RNA for ribosome formation.
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conceiving. If it does not aid a couple in conceiving‚ IVF can also be used to aid individuals who wish to have children through means of a donor. IVF is an assistive reproductive technology (ART) that joins two gametes‚ a sperm and an egg‚ to form a zygote. After the woman has undergone hormonal therapy (superovulation)‚ which works to stimulate the follicles‚ the mature eggs are retrieved. The sperm is provided by the donor/partner and fertilized in one of two ways: a dish or intracytoplasmic sperm
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Biology‚ 7e (Campbell) Chapter 13: Meiosis and Sexual Life Cycles Chapter Questions 1) What is a genome? A) the complete complement of an organism’s genes B) a specific sequence of polypeptides within each cell C) a specialized polymer of four different kinds of monomers D) a specific segment of DNA that is found within a prokaryotic chromosome E) an ordered display of chromosomes arranged from largest to smallest Topic: Concept 13.1 Skill: Knowledge 2) Which of the following
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(referring to the fact that each kind of chromosome is represented twice). In higher organisms when an egg is fertilized the egg and sperm fuse to form a single cell called a zygote which develops into a new organism. If the egg and sperm were both diploid (46 chromosomes each in the case of humans) then the resulting zygote would be tetraploid. This would be an intolerable situation‚ so a mechanism has evolved to insure that each gamete (egg or sperm) contains only one representative of each homologous
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ABSTRACT Stem cells have offered much hope by promising to greatly extend the numbers and range of patients who could benefit from transplants‚ and to provide cell replacement therapy to treat debilitating diseases such as diabetes‚ Parkinson ’s and Huntington ’s disease. The issue of stem cell research is politically charged‚ prompting biologists to begin engaging in ethical debates‚ Stem cell research offers great promise for understanding basic mechanisms of human development and differentiation
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In the alternation of generations life cycle of plants‚ gametes are produced by the gametophyte. homospores. fruit. sporangia. strobili. Characteristics of eudicots include all EXCEPT two cotyledons. woody or herbaceous plants. leaves with netted veins. vascular bundles arranged irregularly in the stem. flower parts in fours and fives. Which plant structure is not found in the lycophytes? microphylls microspores archegonia rhizome Gymnosperm are characterized by producing "naked seeds". Which
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fertilization occurs‚ and then it is considered a fetus (Embryo). The development of the embryo is called embryogenesis. It always starts with the fertilization of the egg by the sperm. The fertilized egg is then referred to as a zygote (Embryogenesis). The zygote will go through mitotic divisions with no significant growth and cellular differentiation‚ which will lead to the development of the embryo
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