A gene showing co-dominance has

1. One allele dominant on the other 

2. Alleles tightly linked on the same chromosome

3. Alleles that is recessive to each other

4. Both alleles independently expressed in the heterozygote

Subtopic:  Dominance Deviation from Mendel: 1 |
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The term "linkage" was coined by

1. T.H. Morgan

2. T.Boveri

3. G.Mendel

4. W.Sutton

Subtopic:  Linkage |
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In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree: 
  

1. Autosomal dominant

2. X-linked recessive

3. Autosomal recessive

4. X-linked dominant

Subtopic:  Pedigree Analysis: Basics | Pedigree Analysis: Problem Solving |
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A colour-blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colour blind? (consider the grandsons only through son)

1. 0.5

2. 1

3. Nil

4. 0.25

Subtopic:  Sex Linked Recessive Inheritance |
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In his classic experiments on pea plants Mendel did not use

1. Seed color

2. Pod length

3. Seed shape

4. Flower position

Subtopic:  Introduction to Genetics: 2 |
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A pleiotropic gene

1. Is expressed only in primitive plants

2. Is a gene evolved during  Pliocene

3. Controls a trait only in combination with another gene

4. Controls multiple traits in an individual 

Subtopic:  Polygenic Inheritance & Pleiotropy |
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How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?

1. Five
2. Six
3. Eight
4. Seven

Subtopic:  Introduction to Genetics: 1 | Introduction to Genetics: 2 |
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The movement of a gene from one linkage group to another is called
1. inversion
2. duplication
3. translocation
4. crossing over

 

Subtopic:  Understanding Linkage |
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Multiple alleles are present
1. on different chromosomes
2. at different loci on the same chromosome
3. at the same locus of the chromosome
4. on non-sister chromatids

Subtopic:  Dominance Deviation from Mendel: 2 |
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An abnormal human baby with 'XXX' sex chromosomes was born due to :
(1) formation of abnormal ova in the mother
(2) fusion of two ova and one sperm
(3) fusion of two sperms and one ovum
(4) formation of abnormal sperms in the father

Subtopic:  Sex Aneuploidy - Turner & Klinefelter Syndrome |
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