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Genetics and Sex-Linked Inheritance Quiz

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Genetics and Sex-Linked Inheritance Quiz

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Questions and Answers

What is the purpose of X inactivation?

To ensure proper functioning of Y-linked genes

To increase gene expression in males

To equalize gene expression between males and females

To prevent double dosage of X-linked genes in females (correct)

What is nondisjunction?

Duplication of a portion of a chromosome

Exchange of genetic material between non-homologous chromosomes

Failure of homologous chromosomes to separate during cell division (correct)

Loss of a portion of a chromosome

What is the result if nondisjunction occurs during meiosis I?

One gamete with an extra chromosome and one with a missing chromosome (correct)

All gametes with a missing chromosome

All gametes with an extra chromosome

Two gametes with an extra chromosome

The Philadelphia chromosome is an example of which alteration in chromosome structure?

<p>Translocation</p> Signup and view all the answers

What is the X-Y system of sex-linked inheritance?

<p>The system where genes are located on both the X and Y chromosomes</p> Signup and view all the answers

Study Notes

X Inactivation

X inactivation is a process that ensures equal expression of genes between males and females by inactivating one of the two X chromosomes in females.

Chromosomal Alterations

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division, resulting in abnormal chromosome numbers.

Meiosis and Nondisjunction

If nondisjunction occurs during meiosis I, the result is daughter cells with an abnormal number of chromosomes, specifically, one cell with an extra chromosome and one cell with a missing chromosome.

Chromosomal Structure Alterations

The Philadelphia chromosome is an example of a translocation, which is a type of alteration in chromosome structure where a segment of a chromosome breaks off and attaches to another non-homologous chromosome.

Sex-Linked Inheritance

The X-Y system of sex-linked inheritance is a system where the sex of an individual is determined by the presence of sex chromosomes (X and Y), and certain traits are linked to these chromosomes.

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Description

Test your knowledge of genetics and sex-linked inheritance with this quiz. Explore topics such as X-Y system, X-O, Z-W, and haplo-diploid systems of sex determination, setting up and interpreting results of crosses involving sex-linked traits, purpose of X inactivation, randomness of X inactivation, nondisjunction, and its consequences.