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Chapter 12 Dna And Rna Answer Key

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Effect on blood-glucose level. Diabetes||Polygenic disorder||. Down's Syndrome: Down's syndrome is caused due to the presence of an additional copy of chromosome 21 (Trisomy of 21). Page No 193: Question 1: a. In order to prevent this transmission, people should get their blood examined before marriage to know if they are a carrier of any genetic disorder. All questions and answers from the Science And Technology Solutions Book of Class 9 Science Chapter 16 are provided here for you for free. Rather, we sholud support and accept people with such disorders, so that they can live a normal life. 44+XXY||Pale skin, white hairs|. As a result, it has one arm, which is extremely long and the other, which is extremely short. • A phosphate group is linked to 5'-OH of a nucleoside through phosphoester linkage to form a corresponding nucleotide. B. Monogenic disorders: Monogenic disorders are genetic disorders which are caused by a mutation in a single gene. Chapter 12 dna and rna study guide answer key. Example- a cross between tall plant having red flower and a dwarf plant having white flower. D. A RNA nucleotide has three main components − a nitrogenous base, a ribose sugar and a phosphate group. D. No, it is not right to avoid living with a person suffering from a genetic disorder.

Chapter 12 Dna And Rna Answer Key

B. DNA is a very large single molecule also called as macromolecule. Nitrogen bases are attached sugar from inwards that extends to join hydrogen bond and the complimentary nitrogenous base from other strand. • The end of the chain which has a free phosphate moiety at 5'-end of ribose sugar is referred to as 5'-end and the other end of the chain having a free 3'-OH group at the ribose sugar is referred to as 3' -end of the polynucleotide chain. Chapter 12 dna and rna answer key 12-2. 9% of the base sequences in all human beings are identical. This disorder arises during development. C. |Monohybrid cross||Dihybrid cross|.

Chapter 12 Dna And Rna Answer Key West

You will also love the ad-free experience on Meritnation's Science And Technology Solutions Solutions. D. Chromosomes are mainly made up of DNA. Some of the examples of monogenic disorders are sickle cell anemia, cystic fibrosis, polycystic kidney etc. Chapter 12 dna and rna answer key west. It is the remaining 0. Question 7: Complete the tree diagram below based on types of hereditary disorders. Chromosomes are divided into four types based on the position of the centromere. E. Organisms produced through sexual reproduction show major variations.

Chapter 12 Dna And Rna Answer Key 12-2

Genetic disorders are not communicable diseases that would be transmitted to people who come in contact with people with genetic disoders. C. The component which is in the nuclei of cells and carries the hereditary characteristics is called chromosome. This mutation may be present on one or both the chromosomes. 2) Sub-metacentric chromosomes: In sub-metacentric chromosomes, the centromere lies slightly away from the middle region. A monohybrid cross is useful in determining the dominance of genes. As a result, the chromosome has only one arm. As a result, it has one arm slightly longer than the other. All Science And Technology Solutions Solutions for class Class 9 Science are prepared by experts and are 100% accurate. Leber hereditary optic neuropathy|| Mitochondrial.

Chapter 12 Dna And Rna Study Guide Answer Key

E. It is necessary for people to have their blood examined before marriage because the genetic disorders are transmitted only by reproduction. • Many nucleotides are linked through 3'-5' phosphodiester linkages to each other to form the polynucleotide chain. 3) Acrocentric chromosomes: In acrocentric chromosomes, the centromere is located close to the end of the chromosome. There is no particular treatment for sickle cell anemia, the treatments which are available provide symptomatic relief from the symptoms associated with this disorder. The cross in which only two pairs of contrasting characters are involved is known as dihybrid cross. Klinefelter syndrome. Explain Mendel's monohybrid progeny with the help of any one cross. A. Monohybrid cross is a cross between two parents that have one pair of contrasting characters; for example, if pea plant with yellow seed coat is crossed with pea plant having green seed coat then in the F1 generation all the plants produce yellow seeds. It was the first discovered and described chromosomal disorder in humans. Hereditary characters are transferred from parents to offsprings by gene, hence they are said to be structural and functional units of heredity. It can be used for studying evolution and genetic diversity in a population. 1) Metacentric chromosomes: In these chromosomes, the centromere is present in the middle, which gives rise to two equal arms. View NCERT Solutions for all chapters of Class 9.

The total number of chromosomes in people affected with Down's syndrome becomes 47. C. DNA fingerprinting is a method for comparing the DNA sequences of any two individuals. A dihybrid cross is useful in studying the assortment of the offspring. Genetic disorders are caused by changes in DNA sequences which can only be passed from one generation to another under specific circumstances. What is meant by 'chromosome'. It has a double helix structure, similar to a ladder, which is twisted at both ends. The applications of DNA fingerprinting are as follows: -. These solutions for Heredity And Variation are extremely popular among Class 9 students for Science Heredity And Variation Solutions come handy for quickly completing your homework and preparing for exams. 4) Telocentric chromosomes: In telocentric chromosomes, the centromere is present at the terminal end. Monogenic disorder||Effect on blood-glucose level|. If a carrier/sufferer of a genetic disorder marries a person who is also a carrier/ sufferer of the disorder, then there are chances that disorder will be passed on to the offsprings. 1% that makes every individual unique. 44+X:Turner syndrome::44+XXY:-.............. Science And Technology Solutions Solutions for Class 9 Science Chapter 16 Heredity And Variation are provided here with simple step-by-step explanations.

There are 3 types of RNA: 3. rRNA (ribosomal RNA) − These are the work benches of translation. • A nitrogenous base is linked to the ribose sugar through N-glycosidic linkages to form a nucleoside (like adenosine, guanosine or cytidine and uridine). DNA fingerprinting forms the basis of paternity testing since a child inherits polymorphism from both its parents. They play a structural and catalytic role during translation. Monogenic disorder||Pale skin, white hairs|. Example- a cross between tall and dwarf plant||. 44+XXY||Men are sterile|. Affected individual has short stature, small, round head, furrowed tongue, partially opened mouth, palm crease, congenital heart disease and mental retardation. • The ribose sugar and the phosphates form the backbone of a polynucleotide chain with nitrogenous bases linked to sugar moiety and projecting from the backbone.

The DNA molecule is made up of basic materials called nucleotides and each nucleotide is made up of three components: - Sugar. Question 5: How are the items in groups A, B and C inter-releated? • Every nucleotide residue has an additional −OH group present at 2' -position in the ribose.