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What is an allele?...

What is an allele?

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An alternate form of a gene for a character present on identical loci of two homologous chromosomes is known as an allele.
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What are alleles?

The ability of certain people to taste the chemical phenylthiocarbamide (PTC) is governed by a dominant allele T, and the inability to taste PTC by its recessive allele t. If 24% of a population is homozygous taster and 40% is heterozygous taster, what is the frequency of t?

What is a seed ? What are the two major parts of seed ?

What is multiple alleles? How do the multiple allele affect the organism?

A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population

[A]: When doing genetics problems, firs de- cide the appropriate key and then determine the genotype and gametes for both parents. [R]: It is necessary to keep in mind that al- though an individual has two alleles for each trait, each gamete has only one allele for each trait

The weight of fruit in a plant is determined by the number of dominant alleles of a certain number of genes. If seven weight categories are noticed, how many gene sites would be involved?

ABO blood grouping is controlled by gene I which has three alleles and show co-dominance. There are six genotypes. How many phenotypes in all are possible?

For the MN-blood group system, the frequencies of M and N alleles are 0.7 and 0.3, respectively. The expected frequency of MN-blood group bearing organisms is likely to be :

Read the following statements and choose the correct option A. Increase in melanized moths after industrialization in Great Britain is a proof for natrual selection B. When more individuals of a population acquire a mean character value, it is called disruption C. Changes in allelic frequency in a population will lead to Hardly Weinberg equilibrium D. Genetic drift changes the existing gene ot allelic frequency in future generations

OSWAAL PUBLICATION-PRINCIPLES OF INHERITANCE AND VARIATIONS -(TOPIC 2 ) (SEX DETERMINATION AND GENETIC DISORDERS (MULTIPLE CHOICE QUESTIONS ))
  1. What is an allele?

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  2. All genes located on the same chromosome :

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  3. Conditions of a karyotype 2n pm 1 and 2n pm 2 are called :

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  4. Distance between the genes and percentage of recombination shows :

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  5. If a genetic disease is transferred from a phenotypically normal but c...

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  6. In sickle cell anaemia glutamic acid is replaced by valine. Which one ...

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  7. Person having genotype I^A IB would show the blood group as AB. This i...

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  8. ZZ/ZW type of sex determination is seen in :

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  9. A Across between two tall plants resulted in offspring having few dwar...

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  10. In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that:

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  11. Which of the following will not result in variations among siblings?

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  12. Mendel's Law of independent assortment holds good for genes situated o...

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  13. Occasionally, a single gene may express more than one effect. The phen...

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  14. In a certain taxon of insects some have 17 chromosomes and the others ...

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  15. The inheritance pattern of a gene over generations among humans is stu...

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  16. It is said that Mendel proposed that the factor controlling any charac...

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  17. Two genes 'A' and 'B' are linked. In a dihybrid cross involving these ...

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  18. In the F2 generation of a Mendelian dihybrid cross the number of pheno...

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  19. Mother and father of a person with 'O' blood group have 'A' and 'B' bl...

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