| True / False |
Statement |
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A karyotype is a picture of cells undergoing crossing over.
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A normal human somatic cell contains 23 pairs of chromosomes.
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The production of egg cells by meiosis is called "oogenesis".
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Chromosomes are paired up in a karyotype according to colour.
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The absence of one of a pair of chromosomes on a karyotype is referred to as a "monosomy".
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| True / False |
Statement |
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Down Syndrome occurs when an extra X chromosome is present.
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XY represents the sex chromosomes for a normal female.
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XXY represents a female with Turner's Syndrome.
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XO represents a female who is usually short and infertile.
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Assume H = normal blood and h = hemophilia. An individual with XhXH would be a female suffering from hemophilia.
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| True / False |
Statement |
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Assume H = normal blood and h = hemophilia. An individual with XhY would be a male suffering from hemophilia.
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Genes located on the X chromosome are said to be "sex linked".
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Most sex linked disorders are passed on to daughters.
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Only men can be carriers of sex linked disorders.
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If a sex linked disorder is caused by a dominant gene (D), an individual with genotype XDXd will suffer from the disorder.
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| True / False |
Statement |
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The sperm cell ultimately determines the sex of a baby because a sperm cell can carry either an X or a Y chromosome.
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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.
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In Mendelian genetics, a capital letter represents a dominant trait, ie. "t".
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The genotype "Tt" is called "homozygous".
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In the cross: Tt x Tt (where T = tall, t = dwarf), 75% of the offspring are tall.
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