True-False Quiz 5 - Genetics:
True / False

A karyotype is a picture of cells undergoing crossing over.

A normal human somatic cell contains 23 pairs of chromosomes.

The production of egg cells by meiosis is called "oogenesis".

Chromosomes are paired up in a karyotype according to colour.

The absence of one of a pair of chromosomes on a karyotype is referred to as a "monosomy".
True / False

Down Syndrome occurs when an extra X chromosome is present.

XY represents the sex chromosomes for a normal female.

XXY represents a female with Turner's Syndrome.

XO represents a female who is usually short and infertile.

Assume H = normal blood and h = hemophilia. An individual with XhXH would be a female suffering from hemophilia.
True / False

Assume H = normal blood and h = hemophilia. An individual with XhY would be a male suffering from hemophilia.

Genes located on the X chromosome are said to be "sex linked".

Most sex linked disorders are passed on to daughters.

Only men can be carriers of sex linked disorders.

If a sex linked disorder is caused by a dominant gene (D), an individual with genotype XDXd will suffer from the disorder.
True / False

The sperm cell ultimately determines the sex of a baby because a sperm cell can carry either an X or a Y chromosome.

Sperm cells carrying the X chromosome can be separated in the lab from those carrying the Y chromosome because the Y chromosome is smaller making these sperm lighter.

In Mendelian genetics, a capital letter represents a dominant trait, ie. "t".

The genotype "Tt" is called "homozygous".

In the cross: Tt x Tt (where T = tall, t = dwarf), 75% of the offspring are tall.