again‚ forming four cells also consisting of 23 chromosomes‚ and the cell undergoes the change in order to perform its more specialized function for reproduction. This production takes place in the male gonads‚ also known as the testes. Oogenesis Oogenesis‚ also called ovigenesis‚ is the process in which the female anatomy produces egg cells. The egg cell is made up of three layers: a jelly coat‚ the vitelline layer‚ and the egg cell ’s plasma membrane. A hormone
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WHAT IS A CELL? It is the smallest unit of life that is classified as a living thing‚ and is often called the building block of life. The cell is the basic structural and functional unit of all known living organisms. Some organisms are unicellular (made of only one cell) while others are multicellular (made up of several cells). The word cell comes from the Latin cellula‚ meaning‚ a small room. The term was coined by Robert Hooke in a book he published in 1665 when he compared the cork cells he
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N10/4/BIOLO/HPM/ENG/TZ0/XX 88106001 Biology HigHer level PaPer 1 Tuesday 2 November 2010 (afternoon) 1 hour INSTRUCTIONS TO CANDIDATES • Do not open this examination paper until instructed to do so. • Answer all the questions. • For each question‚ choose the answer you consider to be the best and indicate your choice on the answer sheet provided. 8810-6001 17 pages © International Baccalaureate Organization 2010 – 2 – 1. N10/4/BIOLO/HPM/ENG/TZ0/XX [Question and image
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The system facilitates reproduction in human beings. Reproduction involves first of all sexual intercourse in which there is ejaculation of sperms‚ by the male‚ into the female’s reproductive tract. Ejaculation is in form of semen. Sperms travel to fertilize eggs in females. This results in fertilization leading to the development of the baby. Function of reproductive system in females is to produce eggs and to nourish developing offsprings. On the other hand‚ male reproductive system is to produce
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Reproductive System Function: Anatomy of Male Reproductive System Major Organs producing offspring External Reproductive Organs propagation of the species penis and scrotum !in terms of evolution – the only reason all the other systems exist Internal Organs: only major system that doesn’t work continuously ! only activated at puberty these structures form continuous tube: Testes epididymus vas deferens ejaculatory duct urethra in penis unlike most other organisms
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Parts Against diuresis Relating to Meaning of Word Key Term Spermatogenesis Prefixes Roots Suffixes Word Dissection sperm genesis Meaning of Parts sperm Production of Meaning of Word Production of sperm Key Term Oogenesis Prefixes Roots Suffixes Word Dissection oo genesis Meaning of Parts eggs Production of Meaning of Word Production of eggs Key Term Endometrium Prefixes Roots Suffixes Word Dissection endo metr um Meaning of Parts
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Introduction: The process of Meiosis involves 2 nuclear divisions that result in the formation of four haploid cells (2). Meiosis I is preceded by interphase‚ during which DNA synthesis occurs and each chromosome is made of two chromatids joined at the centromeres. In meiosis I‚ chromatids of homologous chromosomes may exchange parts by crossing over. During Prophase I homologous chromosomes come together and synapse. A tetrad consisting of four chromatids is also formed (2). In Metaphase I‚ the
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REPRODUCTIVE SYSTEM Reproductive System A system of sex organs within an organism which work together for the purpose of sexual reproduction. Many nonliving substances such as fluids‚ hormones‚ and pheromones are also important accessories to there productive system. Sexual reproduction produces new individuals - Gametes (sperm & egg) formed by testes and ovaries - Fertilization produces one cell (a zygote)with one set of chromosomes from each parent - Creates genetic variation . Gonads produce
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Crossing over- The two chromosomes making up a homolog pair are not genetically identical because homologs are inherited from different parents. When the chromosomes synapse during prophase 1‚ each gene in each chromosome is brought into contact with the same gene on that chromosome’s homolog. During this process of synapses the two chromosomes of each homolog pair exchange segments of DNA in a process called crossing over. The gene combinations on a chromosome can be changed. For example‚ suppose
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new host bacterium. A. 1‚ 2‚ 3‚ 4 C. 3‚ 1‚ 2‚ 4 B. 4‚ 3‚ 2‚1 D. 2‚ 3‚ 1‚ 4 2. Which is not a clone? A. a colony of identical bacterial cells B. identical quintuplets C. a forest of identical trees D. eggs produced by oogenesis E. copies of a gene through PCR 3. Restriction enzymes found in bacterial cells are ordinarily used A. during DNA replication B. to degrade the bacterial cell’s DNA C. to degrade viral DNA that enters the cell D. to attach
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