Fertilization in Humans Fertilization begins with the fusion of two haploid cells into a diploid cell‚ the two haploid cells being a sperm cell and an egg cell into the diploid cell being zygote. The union can either be an external fertilization or an internal fertilization. This essay will focus on the internal fertilization found in mammals‚ and more specific‚ in humans. The first part will consider human anatomy of both the female and male sexual reproductive systems‚ and then follows a
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Reproduction Male sperm fuses with female egg. If tdf (a gene) is present‚ then the embryo develops testes and produces testosterone. Female Reproductive system • Female baby develops if tdf is not present. • Tdf – a gene located on Y chromosome; if girl‚ then two X chromosomes‚ hence no Tdf. • Female hormones: progesterone and estrogen ( both secreted by mother’s ovaries and placenta which allow female genetilia to develop. Parts of the female reproductive system:
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poor egg quality‚overactive or underactive thyroid gland‚etc. Other factors that affect infertility include age‚smoking‚heavy drinking‚ being overweight or obese‚ over or under exercising‚ eating disorders‚ sexually transmitted infections and even being stressed. Are only women infertile? No‚about 20% of cases of infertility are due to a problem with the man. Just as women can have complications with their reproductive organs men can experience this as well. Complications include sperm abnormalities
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turn the follicles do not produce eggs and are eventually form fluid-filled cysts that then cover the ovaries. Endometriosis‚ another disease found to cause infertility in women‚ refers to a condition in which sections of the uterine lining implant in the vagina‚ ovaries‚ fallopian tubes or pelvis. These implants eventually form cysts that grow with each menstrual cycle‚ and may eventually turn into blisters and scars. The scars can then block the passage of the egg. Other problems that can arise in
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allowing maximum amount of oxygen to be transported. Sperm cells A sperm cell is the male reproductive cell that carries the male portion of chromosomes and deoxyribonucleic acid (DNA) information to be fused with the female egg or ovum. The sperm cell carries various amount of heredity information inside the cell nucleus. There are various ways in which sperm can be transmitted to the egg for fertilization. The sperm cell can be sent to the female egg through sexual intercourse. Starting from puberty
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introduction of sperm into a female’s uterus to make her pregnant. It is a cost-effective method which
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was unable to have children on her own was because her tubes were badly destroyed by scars and inflammation‚ not even surgery was able to help her. According to How to get pregnant‚p197” All that was required was to take an egg from her ovary; mix it with her husband’s sperm in a test tube‚ and then transfer the three-day-old embryo into her womb for the next nine months into a full-term baby. This creating In Vitro fertilization took many years. The two doctors Patrick Steptoe and Robert Edwards
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Silence of the Bees: • How do bees communicate? Bees communicate through dance (the waggle dance). A methodic combination of buzzing‚ moving the behind in a figure-eight fashion that informs other bees about pollen/ food that is found in a particular area. • Why are bees so important to the U.S. agriculture industry? Honeybees are the most important pollinator on the planet. They pollinate crops‚ which in turn creates food to eat. What percentage of the industry do bees account for? They account
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2013.4 a. seminiferous tubules penis contains erectile tissues that surrounds the urethra (700’ of seminiferous tubules in testes) ! functions in spermatogenesis: ! fill with blood during sexual arousal formation and maturation of sperm cells corpus spongiosum (lower – surrounds urethra) passes along ventral side of penis and encloses urethra 2 coropora cavernosum on dorsal side 2 in cross section: seminiferous tubules appear roughly circular and contain germinal epithelium
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begin with many eggs that are hidden”‚ this informs us that like humans plants also contain eggs. Then such as female mammal the flower contains ovaries which are located where the petals join the stem. The pollen is delivered by a bee and it grows a long tube that enters the eggs. This is the plants type of fertilization. Then the seed will fall into the ground where it will grow into another flower. Plants have pollen and eggs; however mammals have eggs and sperm. The sperm comes from the male
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