In this none of the alleles are recessive and the phenotype of all the alleles are expressed. [March-2013] Answer: a. Autosomal dominant trait, eg., muscular dystrophy b. Autosomal recessive trait, eg., sickle-cell anaemia. These individuals have a great resistance to infection and have a greater chance of surviving outbreaks. E.g. Can a child have blood group O if his parents have blood group ‘A’ and ‘B’? Genotype of mother — IA i
So selfing the F1 generation is sufficient to obtain the F2 generation. Answer. They could be grown on simple synthetic medium (ripe banana) in the laboratory. It is found in greatest frequency in populations where malaria was and often still is a serious problem. Male-to-male inheritances is not possible for X-linked traits in humans. Answer. Autosome– All chromosomes apart from the sex chromosomes are called the Autosomes. When strength of linkage increases, decrease the recombinant. A.10. A12. The ratio of offspring in the next generation will be 1 :1. It may be triploid or tetraploid. Answer. The individuals exhibit the following characteristics: 2) XXY– The presence of an additional copy of an X-chromosome results in Kleinfelter’s syndrome. Certificate | Certificate Online, What is a Certificate? If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is
13. Q.2. Explain the Law of Dominance using a monohybrid cross. As per the past trends, one can easily deduce that the Unit, on the whole, carries close to 18 marks.
Give one example. Answer: a.
Test No. Types of Certificates and Purposes, No Objection Certificate (NOC) | NOC for Employee, NOC for Students, NOC for Vehicle, NOC for Landlord, Best English Slogans of All Time | Catchy Proverbs and Taglines List. The result shows that the four types of offspring are in a ratio of 1:1:1:1. He observed that the two genes did not segregate independently of each other and the F2 ratio deviated very significantly from the. What is recombination? Very Short Answer Type Questions How is it different from polyploidy? 14. The details of this concept may seem difficult but practice makes it easier. But for getting the F2 generation, he simply self-pollinated the tall F1 plants. Also Acess Class 12 Biology Sample papers and class 12 Biology Previous Year Question Papers, Important Questions for Class 12 Biology Failure of cytokinesis after telophase stage of cell division results in an increase in a whole set of chromosomes in an organism and,this phenomenon is known as polyploidy. Answer Mendel selected pea plants to carry out his study on the inheritance of …
1. 13. 7. It is, however, lethal in animals. Answer. Drosophila is extensively for genetic studies because it has the following characteristics: They can be grown in the laboratory on simple synthetic medium. Question 15. A blood group means it exist as iA or iA iA, B blood group means, it exist as iBi, iBiB. Question 1: Mention the advantages of selecting pea plant for experiment by Mendel. Question 17. During the second pregnancy they visited a ge netic counsellor and he prepared a pedigree chart of their family. A colour-blind father has a daughter with normal vision. Occasionally, a single gene, may express more than one effect. He wrote a book ‘Theory of Gene’ and was awarded Nobel Prize in 1933. In natural selection, the difference in reproductive success based on a particular trait is driven by natural processes like predators, weather conditions, and environmental constraints. One allele for a specific trait is not completely expressed over the other allele for the same trait. The principles of inheritance and variation were explained by Gregor Mendel in his experiments on a pea plant. Answer. (c) Linkage When experiments on snapdragon was conducted, Raju got the flower colour ratio 1 red: 2 pink: 1 white, does it follow Mendelian inheritance ratio? (b) Crossing over b. In guinea pigs, there is a cross carried out between a heterozygous male with black coat colour (Bb) and a female having white coat colour (bb). Substitution of glutamic acid by valine at the sixth position of the beta globin chain of haemoglobin molecule (Point mutation). Free PDF download of Important Questions with Answers for CBSE Class 12 Biology Chapter 5 - Principles of Inheritance and Variation prepared by expert Biology teachers from latest edition of CBSE(NCERT) books. It states that a dominant allele expresses itself in a monohybrid cross and suppresses the expression of recessive allele. How to Create Worksheets using Test Generator? Which one of the above is an example of inborn error of metabolism? (c) Pleiotropy (d) Polygeny Humans have 23 pairs of chromosomes and Humans have 23 pairs of chromosomes. What does it tell us about the nature of alleles involved? 3.
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