Sexual Reproduction Biology
INTRODUCTION
I. Have you ever wondered how the process of sexual reproduction begins in multi-cellular organisms such as ourselves?
II. It all begins through a cell division process known as meiosis.
III. I am currently a biology major at CSU-Pueblo looking to pursue a degree in wildlife biology.
IV. During the process of meiosis, diploid cells split in half, forming four haploid cells, which each have a single set of chromosomes. These cells are called either gametes or sex cells. Female gametes are egg and male gametes are sperm. Two meiotic divisions occur known as meiosis I and meiosis II, and each one of these divisions have four stages, which are; prophase, metaphase, anaphase, and telophase.
Now, I will discuss the definition and stages of meiosis.
BODY …show more content…
Female gametes are egg cells and male gametes are sperm cells.
2. When the sperm cell fuses with and fertilizes an egg cell, a zygote or fertilized egg forms.
B. There are two divisions of meiosis known as meiosis I and meiosis II that occur, and each division has four stages: prophase, metaphase, anaphase, and telophase.
II. I will now discuss the four stages of meiosis I.
A. During the first stage, which is prophase I, homologous chromosomes join together and cross over forming tetrads they condense.
B. In metaphase I, homologous chromosomes are moved to the metaphase plate, by microtubules. Independent assortment also occurs.
C. In anaphase I, homologous chromosomes are separated by microtubules, while sister chromatids stay together.
D. During telophase I, chromosomes are decondensed, travel to opposite poles, and cell membranes are closed off by cytokinesis, creating two daughter cells.
III. Now I will talk about the division of meiosis II.
A. In prophase II, the nucleoli and the nuclear envelope disappear and chromatids become shorter and thicker. Centrosomes travel to opposite poles and spindle fibers are arranged.
B. During metaphase II, sister chromatids join up together at the new metaphase
I. Have you ever wondered how the process of sexual reproduction begins in multi-cellular organisms such as ourselves?
II. It all begins through a cell division process known as meiosis.
III. I am currently a biology major at CSU-Pueblo looking to pursue a degree in wildlife biology.
IV. During the process of meiosis, diploid cells split in half, forming four haploid cells, which each have a single set of chromosomes. These cells are called either gametes or sex cells. Female gametes are egg and male gametes are sperm. Two meiotic divisions occur known as meiosis I and meiosis II, and each one of these divisions have four stages, which are; prophase, metaphase, anaphase, and telophase.
Now, I will discuss the definition and stages of meiosis.
BODY …show more content…
Female gametes are egg cells and male gametes are sperm cells.
2. When the sperm cell fuses with and fertilizes an egg cell, a zygote or fertilized egg forms.
B. There are two divisions of meiosis known as meiosis I and meiosis II that occur, and each division has four stages: prophase, metaphase, anaphase, and telophase.
II. I will now discuss the four stages of meiosis I.
A. During the first stage, which is prophase I, homologous chromosomes join together and cross over forming tetrads they condense.
B. In metaphase I, homologous chromosomes are moved to the metaphase plate, by microtubules. Independent assortment also occurs.
C. In anaphase I, homologous chromosomes are separated by microtubules, while sister chromatids stay together.
D. During telophase I, chromosomes are decondensed, travel to opposite poles, and cell membranes are closed off by cytokinesis, creating two daughter cells.
III. Now I will talk about the division of meiosis II.
A. In prophase II, the nucleoli and the nuclear envelope disappear and chromatids become shorter and thicker. Centrosomes travel to opposite poles and spindle fibers are arranged.
B. During metaphase II, sister chromatids join up together at the new metaphase