Sex Determination (Nursing)

by Jasmine Clark, PhD

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    00:01 So how is the genetic sex of a fetus or eventual infant determined/ of the 46 chromosomes and the fertilized eggs only two of them are sex chromosomes.

    00:15 The rest of them we refer to them as autosomes are autosomal chromosomes.

    00:21 The two sex chromosomes include the X chromosome, which is the larger of the two, and then the Y chromosome, which is actually quite small.

    00:31 Females contain two X chromosomes where each ovum always has an X chromosome.

    00:41 And males, you're going to have X and Y chromosomes so in the male body 50% of the sperm are going to contain X chromosomes and 50% of the sperm are going to contain Y chromosomes.

    00:57 So if fertilizing sperm delivers an X to the fertilized eggs, then it will contain an X X and the embryo will develop ovaries.

    01:08 However, if the fertilizing sperm delivers a Y chromosome, then the fertilized egg will contain X Y and the embryo will develop testes.

    01:20 The development of testes is caused by the SRY gene, which is a master switch on the Y chromosome.

    01:29 It's important for the initiation of testes development and maleness.

    01:35 Because it is the father or the sperm that will deliver the X or the Y and because the ovum always contains X chromosomes.

    01:46 It is the father that determines the sex of a child during conception.

    About the Lecture

    The lecture Sex Determination (Nursing) by Jasmine Clark, PhD is from the course Female Reproductive System – Physiology (Nursing).

    Included Quiz Questions

    1. XX
    2. XY
    3. YY
    4. XYX
    1. Father
    2. Mother
    3. Both
    4. Neither. It depends on the SRY gene.

    Author of lecture Sex Determination (Nursing)

     Jasmine Clark, PhD

    Jasmine Clark, PhD

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