Chapter 11-4 Meiosis

Let’s make a sex cell! Meiosis – Production of haploid gametes Meiosis – Production of haploid gametes Diploid- has paired chromosomes Diploid- has paired chromosomes Haploid- has 1 set of chromosomes Haploid- has 1 set of chromosomes Meiosis is very similar to mitosis with four distinct differences. Meiosis is very similar to mitosis with four distinct differences. The phases of mitosis are run through twice In metaphase 1 the chromosomes line up next to each other. Meiosis produces haploid cells Meiosis results in four cells

Meiosis

Why Sexual Reproduction? Genetic Variation Genetic Variation Independent Assortment- Random distribution of chromosomes Independent Assortment- Random distribution of chromosomes Crossing Over- Switching parts Crossing Over- Switching parts of chromosomes of chromosomes Random Fertilization Random Fertilization

Making Sex Cells Meiosis involves the production of sex cells, namely the sperm and egg. Meiosis involves the production of sex cells, namely the sperm and egg. The production of sperm in men is known as spermatogenesis. The production of sperm in men is known as spermatogenesis. The production of an egg (a.k.a. an ovum) in women is known as oogenesis. The production of an egg (a.k.a. an ovum) in women is known as oogenesis. Meiosis in males results in 4 sperm cells whereas meiosis in females results in only 1 egg Meiosis in males results in 4 sperm cells whereas meiosis in females results in only 1 egg

Sexual & Asexual Reproduction

Asexual Reproduction Asexual Reproduction – Type of reproduction that only involves one parent passing all of its genes to the offspring. Asexual Reproduction – Type of reproduction that only involves one parent passing all of its genes to the offspring. Individuals produced by asexual reproduction are called clones. Individuals produced by asexual reproduction are called clones. Clone – an organism that is genetically identical to its parent. Clone – an organism that is genetically identical to its parent. Examples of this are fission, fragmentation or budding. Examples of this are fission, fragmentation or budding.

Sexual Reproduction Sexual Reproduction – is when two parents form haploid reproductive cells which join to form an offspring. Sexual Reproduction – is when two parents form haploid reproductive cells which join to form an offspring. Sexual Reproduction occurs in eukaryotic cells. Sexual Reproduction occurs in eukaryotic cells. What are some positives and negatives of sexual reproduction and asexual reproduction? What are some positives and negatives of sexual reproduction and asexual reproduction?