Comparing Mitosis and Meiosis Observe: 1. Organisms have a number of chromosomes in each of their body or somatic cells that is unique for that organism. This is called their diploid or 2n number. 2. Cells go through a cell cycle‚ whereby‚ much of the cycle does not include division‚ but at the end of this interphase in their cycle‚ they go through mitosis. 3. Cells replicate their DNA in the S phase of the cell cycle. 4. In the process of mitosis‚ cells replicate their DNA in the nucleus‚ form
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corpus luteum. One corpus luteum is required to release estrogen and progesterone in order to make sure a properly thickened endometrium exists (3 eggs will attach in different places in the case of identical triplets which occurs due to splitting of zygote into 3 separate totipotent cells which would all carry the same DNA). Therefore there would only be one corpus luteum in the ovaries of a woman who has given birth to identical triplets. 4n) Osteoporosis can be prevented by eating balanced meals
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Craniopagus Parasiticus BY Nicole Tuccinardi (cra·ni·op·a·gus pa·ra·si·t’i·cus) Craniopagus Parasiticus? What does that mean? An easier way to say and understand Craniopagus Parasiticus is the statement “Parasitic Twins”. This means conjoined or siamese twins where there is one twin fully developed and another that is usually just a head and occasionally a neck or a torso that is underdeveloped‚ and lives off of the developed twin but is parasitic. The medical definition of Craniopagus Parasiticus
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chromosomes in parent cell‚ > 2 daughter cells (46 chromosome each) Interphase= cell grows‚ DNA duplicates chromosomes‚ cell prepares for division Meiosis 1 parent cell > 4 daughter cells (23 chromosomes each) gametes= sperm/egg zygote= when sperm and egg meet ( end up with 46 chromosomes) prophase 1 – crossing over metaphase 1- chromosome shuffling DNA made up of nucleotides. (4 nucleotides Adenine‚ Guanin‚ Cytosine‚ Thymine) AT‚ GC pair sugar: deoxyribose
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GAUTENG DEPARTMENT OF EDUCATION SENIOR SECONDARY INTERVENTION PROGRAMME LIFE SCIENCES GRADE 12 SESSION 3 (LEARNER NOTES) Page 1 of 10 TOPIC 1: MENDEL’S 1ST LAW‚ SEX AND BLOOD GROUP DETERMINATION Learner Note: Mendel’s Laws are very important and you must understand the basic concepts of Genetics. You must understand the concepts of dominance and how this plays a role in monohybrid crosses (mono = one = one characteristic or trait). Be aware of confusing the word ‘cross/ crossing’ with ‘crossing
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algae or by spore formation (as in fungi). Spore formation takes place by mitosis. Binary fission also takes place (as in bacteria). During sexual reproduction‚ algae form differentiated sex cells that fuse to produce a diploid zygote with two sets of chromosomes. The zygote develops into a sexual spore‚ which germinates when conditions are favorable to reproduce and reform the haploid
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Which of the following is most likely to occur when a tumor-suppressor gene is mutated? - The tumor-suppressor gene and resulting protein may lose its function and ability to suppress cell proliferation. Mutations can produce a polypeptide with increased function. - TRUE ________can convert proto-oncogenes into oncogenes. - Nonsense mutations Most human embryos that are aneuploidy - are spontaneously aborted in the first trimester. Horses and donkeys are closely related species that can
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Should Embryonic Stem-Cell Research Be Banned? In recent times‚ there is a great deal of controversy surrounding stem-cell research. Some say that it will contribute substantially in curing diseases like cancer‚ Parkinson’s‚ Lou-Gehrig’s‚ etc while others claim that it violates the ethical and moral norms and principles of the society. Bills promoting stem-cell research have been vetoed several times‚ making it a political issue as well. However‚ stem-cell research should not be banned because
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COVENANT UNIVERSITY DEPARTMENT OF BIOLOGICAL SCIENCES NAME: OBUEKWE CHUKWUEMEKA AZUBUIKE MAT NO: 12CQ014230 PROGRAMME: MICROBIOLOGY COURSE TITLE:CLINICAL PARASITOLOGY CODE: BLY 225 TOPIC: DESCRIPTION OF THE BIOLOGY AND LIFE CYCLE OF PLASMODIUM INTRODUCTION Plasmodium‚ a genus of parasitic protozoans of the sporozoan subclass Coccidia that are the causative organisms of malaria. Plasmodium‚ which infects red blood cells in mammals (including humans)‚ birds‚ and reptiles
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unite in one of the two fallopian tubes. The fertilized egg‚ known as a zygote‚ then moves toward the uterus‚ a journey that can take up to a week to complete. Cell division begins approximately 24 to 36 hours after conception. Within just a few hours after conception‚ the singe-celled zygote begins making a journey down the fallopian tube to the uterus where it will begin the process of cell division and growth. The zygote first divides into two cells‚ then into four‚ eight‚ sixteen‚ and so on
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