C. |Monohybrid cross||Dihybrid cross|. 1) Metacentric chromosomes: In these chromosomes, the centromere is present in the middle, which gives rise to two equal arms. B. DNA is a very large single molecule also called as macromolecule.
The cross in which only two pairs of contrasting characters are involved is known as dihybrid cross. There is no particular treatment for sickle cell anemia, the treatments which are available provide symptomatic relief from the symptoms associated with this disorder. 1% that makes every individual unique. Chapter 12 dna and rna answer key.com. Rather, we sholud support and accept people with such disorders, so that they can live a normal life. C. DNA fingerprinting is a method for comparing the DNA sequences of any two individuals. As a result, it has one arm, which is extremely long and the other, which is extremely short.
D. No, it is not right to avoid living with a person suffering from a genetic disorder. This disorder arises during development. They play a structural and catalytic role during translation. As a result, the chromosome has only one arm. Chapter 11 dna and genes answer key. • A phosphate group is linked to 5'-OH of a nucleoside through phosphoester linkage to form a corresponding nucleotide. Monogenic disorder||Pale skin, white hairs|.
Chromosomes are divided into four types based on the position of the centromere. A monohybrid cross is useful in determining the dominance of genes. C. The component which is in the nuclei of cells and carries the hereditary characteristics is called chromosome. B. Monogenic disorders: Monogenic disorders are genetic disorders which are caused by a mutation in a single gene. D. Chromosomes are mainly made up of DNA. The total number of chromosomes in people affected with Down's syndrome becomes 47. 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. 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.
DNA fingerprinting forms the basis of paternity testing since a child inherits polymorphism from both its parents. Monogenic disorder||Effect on blood-glucose level|. Nitrogen bases are attached sugar from inwards that extends to join hydrogen bond and the complimentary nitrogenous base from other strand. E. It is necessary for people to have their blood examined before marriage because the genetic disorders are transmitted only by reproduction. 4) Telocentric chromosomes: In telocentric chromosomes, the centromere is present at the terminal end. The applications of DNA fingerprinting are as follows: -. Example- a cross between tall and dwarf plant||. It is a result of replacement of GAG by GUG leading to the substitution of Glu by Val at sixth position of beta globin chain of haemoglobin. Question 7: Complete the tree diagram below based on types of hereditary disorders. This mutation may be present on one or both the chromosomes. View NCERT Solutions for all chapters of Class 9. Down's Syndrome: Down's syndrome is caused due to the presence of an additional copy of chromosome 21 (Trisomy of 21). All questions and answers from the Science And Technology Solutions Book of Class 9 Science Chapter 16 are provided here for you for free. • Every nucleotide residue has an additional −OH group present at 2' -position in the ribose.
Genetic disorders are caused by changes in DNA sequences which can only be passed from one generation to another under specific circumstances.
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