DNA by Rosanna Saprio https://padlet.com/r_saprio1/DNA DEOXYRIBONUCLEIC ACID en-us 2017-09-29 13:56:21 UTC 2019-05-08 10:19:31 UTC hello@padlet.com WHAT IS DNA 1 r_saprio1 https://padlet.com/r_saprio1/DNA/wish/192461019 The nucleus of a cell contains structures called chromosomes, containing the DNA,  that form a mass of threads called chromatin, ]]> 2017-09-29 14:07:19 UTC https://padlet.com/r_saprio1/DNA/wish/192461019 2 DNA stands for deoxyribonucleic acid, and it is in every cell of every living thing. It consists of two chains of repeating units wrapped aroundeach other in a double spiral, as a twisted ladder. r_saprio1 https://padlet.com/r_saprio1/DNA/wish/192464783 2017-09-29 14:14:23 UTC https://padlet.com/r_saprio1/DNA/wish/192464783 3 the DNA molecules carry the genetic code that fix the characteristics of a living thing. r_saprio1 https://padlet.com/r_saprio1/DNA/wish/192469485 Each piece of information is carried on a different section of DNA called GENE.
Except for identical twins, each person's DNA is unique .]]> 2017-09-29 14:23:50 UTC https://padlet.com/r_saprio1/DNA/wish/192469485 r_saprio1 https://padlet.com/r_saprio1/DNA/wish/192474263 DNA VIDEO

]]> 2017-09-29 14:32:46 UTC https://padlet.com/r_saprio1/DNA/wish/192474263 6 Genetics is the study of genes, genetic variation, and heredity in living organisms. The father of genetics is Gregor Mendel, a late 19th-century scientist and Augustinian friar. Mendel studied "trait inheritance", patterns in the way traits are handed down from parents to offspring. He observed that organisms (pea plants) inherit traits by way of discrete "units of inheritance". Gregor Mendel studied the heritable traits in pea plants. In his experiments studying the trait for flower color, Mendel observed that the flowers of each pea plant were either purple or white—but never an intermediate between the two colors. These different versions of the same gene are called alleles.In the case of the pea, each individual plant has two copies of each gene, one copy inherited from each parent. Many species, including humans, have this pattern of inheritance. Organisms with two copies of the same allele of a given gene are called homozygous , while organisms with two different alleles of a given gene are called heterozygous.The set of alleles for a given organism is called its genotype, while the observable traits of the organism are called its phenotype. When organisms are heterozygous at a gene, often one allele is called dominant as its qualities dominate the phenotype of the organism, while the other allele is called recessive as its qualities recede and are not observed. r_saprio1 https://padlet.com/r_saprio1/DNA/wish/221263710 2018-01-14 15:11:06 UTC https://padlet.com/r_saprio1/DNA/wish/221263710 4 Mendel's first law r_saprio1 https://padlet.com/r_saprio1/DNA/wish/221266358 combining the two different color of the peas plants trough a cross-pollination, Mendel created a new generationof plants all with red flowers. The white flower allele seemed to disappear.Mendel called the red flower allele DOMINANT, while the white one RECESSIVE. His first law  (law of segregation) says"in a combination between two pure lines, the offspring is always done by one character which is the dominant one." ]]> 2018-01-14 15:37:12 UTC https://padlet.com/r_saprio1/DNA/wish/221266358 5 SECOND LAW r_saprio1 https://padlet.com/r_saprio1/DNA/wish/223210690
The Mendelian Law of Independent Assortment states that each gene pair acts independently of the other. Gregor Mendel demonstrated that the transmission of traits involving one gene pair (monohybrid inheritance) following the Law of Segregation remains constant even in dihybrid crosses in which parents differ in two sets of characters. Stated another way, the segregation of alleles in one gene pair proceeds independently of the segregation of alleles in other gene pairs during sexual reproduction.



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