facilitated diffusion 8. Particles too large to pass through protein channels in the cell membrane may enter the cell by: A. exocytosis B. selective transport C. endocytosis D. osmotic pressure 9. During mitosis: A. chromosomes are copied B. chromosomes move to opposite sides of the cell C. cytoplasm divides in half D. a new cell wall forms in the center of
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Evolution‚ Genes & the Environment Variation is when you refer to genes; it means that there is a large variety of phenotypes‚ alleles and genotypes which can sometimes cause genetic variation. This results in different physical characteristics. Some examples of variations in humans are eye colour‚ hair colour and gender. Variations caused by the environment are the climate (tanned/pale skin) this is affected by the environment as the sun comes in contact with your skin and will darken it‚ the
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organs of both sexes in a single individual’s body. Normal egg cells form after meiosis and are haploid‚ with half as many chromosomes as their mother’s body cells. Haploid individuals‚ however‚ are usually non-viable‚ and parthenogenetic offspring usually have the diploid chromosome number. Depending on the mechanism involved in restoring the diploid number of chromosomes‚ parthenogenetic offspring may have anywhere between all and half of the mother’s alleles. The offspring having all of the mother’s
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Define - - - - - - Chromosome : Is an organized structure of DNA and protein found in cells - Chromatids : Is one of the two copies of DNA making up a duplicated chromosome‚ which are joined at their centromeres‚ for the process of cell division Stages of Mitosis + Cell Division 1st : INTERPHASE - Chromosomes are copies (# doubles) - Chromosomes appear as threadlike coils (chromatin) at the start‚ but each chromosome and it’s copy (sister chromosome) change to sister chromatids
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Diversity exists because in meiosis there are possibilities of recombination of chromosomes and independent assortment. Randomness occurs when chromosomes line up on the metaphase plate and crossing over of tetrads occurs (McGraw-Hill). When chromosomes experience crossing over‚ many combinations of different genes can occur which can lead to offspring that have different appearances. “Independent assortment produces chromosome combinations that are not present in either parent” (McGraw-Hill). The number
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SBI 3U1 – 07: Biology Examination Definitions Unit 1: Diversity of Living Things ➢ Species: a group of organisms that can interbreed in nature and produce fertile offspring. ➢ Morphology: the branch of biology that deals with the structure or form of organisms. ➢ Phylogeny: the evolutionary history of a species. ➢ Taxonomy: the branch of biology that identifies‚ names‚ and classifies species based on natural features. ➢ Binomial nomenclature: the system of giving a two-word Latin name to
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Biology Notes B1 NOTES: You and Your Genes Chromosomes: They are found inside the nucleus of cells. They are X Shaped Objects that Contain DNA. Each Chromosome is made from two Chromatids. Chromosomes are held together by a disc called a centromere. Chromosomes are always found in Pairs. | | A | T | G | C | C | G | DNA: It Stands for Deoxyribonucleic acid. DNA is Made from Nucleic acids of ten (referred to as bases). The four bases are Adenine (A) which always pairs with Thymine (T)
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Us as a person‚ we have up to 46 chromosomes divided equally between the mother and father. The child therefore gets 23 chromosomes each from both parents. Genes are like the building blocks of hereditary; every child inherits genes from both of their biological parents. Some traits are physical such as: eyes‚ hair and skin color
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present and a double layered membrane surrounds the nuclear body in eukaryotes. Referred to as cell nucleus in eukaryotes‚ such an organelle is called nucleoid in prokaryotes. The nuclear body houses the chromosome in both prokaryotes and eukaryotes. Single in number and circular in shape‚ the chromosome in prokaryotes is made up of Deoxyribonucleic Acid (DNA) and proteins whilst in eukaryotes‚ it is usually more than two in number‚ and composed of DNA‚ histone and other proteins. In terms of ribosomes
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Is abortion an act of murdering a human being? Many will argue that abortion isn’t wrong on the basis that a fetus is not a human being; however‚ many will argue that abortion is wrong because its taking a human life‚ no matter what stage of pregnancy it is in. In my paper I will argue that life begins at conception and arrive at the conclusion that abortion is killing a human being. As well as providing premises for my view‚ I will also provide an objection to my argument. Whatever leads up
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