Consider the following statements regarding
Y chromosome in humans:

I. Y chromosome is a male-determining chromosome in humans
II. Y chromosome contains a gene, SRY, which triggers embryonic development as a male
III. 50 % of sons of a male inherit his Y chromosome 

Of the given statements, the correct statements are:

1. I and II only 2. I and III only
3. II and III only 4. I, II, and III

Subtopic:  Sex Determination |
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Mating between black rats of identical genotype produced offspring as follows: 14 cream colored, 47 black and 19 albino. This ratio can be explained if the pheneomenon exhibited here is:

1. Recessive epistasis
2. Polygenic inheritance
3. Multiple allelism
4. Incomplete penetrance

Subtopic:  Epistasis |
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Identify the incorrect statement regarding test cross?

1. It is used to determine the genotype of an individual exhibiting a dominant phenotype.

2. The testcross parent is always homozygous recessive for all of the genes under consideration.

3. The purpose of the testcross is to discover how many different kinds of gametes are being produced by the individual whose genotype is in question.

4. A homozygous dominant individual will produce two types of progeny and a heterozygous individual will produce only one type of progeny.

Subtopic:  Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
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Sickle cell disease is an example of:

1. Sex linked recessive disorder

2. Pleiotropy

3. Polygenic trait

4. Sex influenced trait

Subtopic:  Mendelian Disorders: Sickle Cell Anemia |
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What decides the frequency of an allele in a population?

1. Dominance
2. Its location on a particular chromosome
3. Its degree of expression
4. Natural selection
Subtopic:  Introduction to Genetics: 1 | Introduction to Genetics: 2 |
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What is the number of linkage groups in humans?

1. 22
2. 23
3. 24
4. 46

Subtopic:  Understanding Linkage | Linkage Types |

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Assuming complete dominance
recessiveness and independent assortment,
the ratio of progeny with the genotypes AaBb,
AABb, Aabb and aaBb from a cross AaBb X
AABb would respectively be:
1. 4:4:2:0
2. 4:2:4:2
3. 4:4:2:2
4. 4:4:2:1

Subtopic:  Dihybrid Cross: General Consideration |
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A certain gene has 5 alleles. What will be the number of possible genotypic combinations?

1. 5
2. 15
3. 32
4. 2

Subtopic:  Polygenic Inheritance & Pleiotropy |

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How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?

1.42.8
3.164.32

Subtopic:  Polygenic Inheritance & Pleiotropy |
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The improvement of microscopy techniques in the late 1800s set the stage for the emergence of modern genetics because:

1. it revealed new and unanticipated features of Mendel’s pea plant varieties.
2. it allowed biologists to study meiosis and mitosis, revealing the parallels between the behaviors of genes and chromosomes.
3. it allowed scientists to see the DNA present within chromosomes.
4. it led to the discovery of mitochondria.
Subtopic:  Introduction to Genetics: 1 | Introduction to Genetics: 2 |
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