Genetics and Sex-Linked Inheritance Quiz

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5 Questions

What is the purpose of X inactivation?

To prevent double dosage of X-linked genes in females

What is nondisjunction?

Failure of homologous chromosomes to separate during cell division

What is the result if nondisjunction occurs during meiosis I?

One gamete with an extra chromosome and one with a missing chromosome

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


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

The system where genes are located on both the X and Y chromosomes

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.

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.

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