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In a population of 1000 individuals, 25% of individuals show the phenotype for sickle cell anaemia (genotype - ss). Assuming the population meets Hardy-Weinberg equilibrium, how many individuals would be carriers of the sickle cell allele but will not show the sickle cell phenotype? 

Important Questions on Evolution

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Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
In a population, NAA and Naa are the numbers of homozygous individuals of allele 'A' and 'a', respectively and NAa is the number of heterozygous individuals. Which one of the following options is the allele frequency of 'A' and 'a' in a population with NAA=90, NAa=40 and Naa=70?
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Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
A human population containing 200 individuals has two alleles at the 'T' locus, named T and t. T, which produces tall individuals, is dominant over t, which produces short individuals. If the population has 90 TT, 40 Tt and 70 tt genotypes, what will be the frequencies of these two alleles in this population?
MEDIUM
Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
In a population of 1600 individuals, 570 have the genotype AA, 75 have Aa and remaining 280 have aa; find out the allelic frequency of alleles A and a
EASY
Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
A population will not exist in Hardy-Weinberg equilibrium if:
HARD
Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
In a population of 1000 individuals 360 belong to genotype AA, 480 to Aa, and the remaining 160 to aa, Based on this data, the frequency of allele A in the population is:
MEDIUM
Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
In a diploid population at Hardy-Weinberg equilibrium, consider a locus with two alleles. The frequencies of these two alleles are denoted by p and q, respectively. Heterozygosity in this population is maximum at:
EASY
Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
The survivors of original population from natural calamities might be genetically different from their ancestors. This kind of evolutionary force is known as
EASY
Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
What is genetic drift? Give one example.
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Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle

Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action?

(a) Darwin’s Finches of Galapagos islands.
(b) Herbicide resistant weeds.
(c) Drug resistant eukaryotes.
(d) Man-created breeds of domesticated animals like dogs.

MEDIUM
Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle

Statement I: The existence of deleterious genes within the populations is called genetic load.
Statement II: The changes in the frequency of a gene that occurs merely by chance in small populations is called genetic drift.

The correct option among the following is

EASY
Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
The factor that leads to Founder effect in population is:
HARD
Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
In a large isolated population, alleles p and q at a locus are at Hardy Weinberg equilibrium. The frequencies are p=0.6 and q=0.4 . The proportion of the heterozygous genotype in the population is
MEDIUM
Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
Transfer of genetic material between populations is best defined as:
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Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
The allele frequency of A'' and a'' in a population are 0.6 and 0.4 respectively. The expected frequency of heterozygous individuals is
EASY
Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
With the help of an algebraic equation, how did Hardy-Weinberg explain that in a given population the frequency of occurrence of alleles of a gene is supposed to remain the same through generations?
HARD
Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
State the Hardy Weinberg Law.
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Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
What is Hardy-Weinberg's principle? Give its importance.
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Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
Assertion (A): Founder effect is a type of genetic drift
Reason (R): The change in the frequency of a gene that occurs merely by chance and not by selection, in very large population, is called genetic drift
HARD
Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
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?
EASY
Biology>Genetics and Evolution>Evolution>Hardy Weinberg's Principle
Genetic drift