Meiosis and Sexual Reproduction
... Abnormal Chromosome Inheritance Trisomy – 3 copies of a chromosome Monosomy – single copy of a chromosome • Only occurs in sex chromosomes in humans ...
... Abnormal Chromosome Inheritance Trisomy – 3 copies of a chromosome Monosomy – single copy of a chromosome • Only occurs in sex chromosomes in humans ...
File
... fertilization: n + n =2n Shows two haploid cells (gametes) coming together to produce diploid (2n) cell-zygote ...
... fertilization: n + n =2n Shows two haploid cells (gametes) coming together to produce diploid (2n) cell-zygote ...
Genetics Notes Overview
... F1: the first generation of offspring resulting from the parental cross; for example, Mendel’s F1 plants all had purple flowers; Mendel allowed this generation to self-pollinate F2: the second generation; the result of the self-pollination of F1 plants; for example, in Mendel’s F2 generation, 3/4 ha ...
... F1: the first generation of offspring resulting from the parental cross; for example, Mendel’s F1 plants all had purple flowers; Mendel allowed this generation to self-pollinate F2: the second generation; the result of the self-pollination of F1 plants; for example, in Mendel’s F2 generation, 3/4 ha ...
DNA
... chromosomes pair off with their similar homologous chromosome. • Chromosomes find their homologous pair and line up at the equator (middle of the cell). ...
... chromosomes pair off with their similar homologous chromosome. • Chromosomes find their homologous pair and line up at the equator (middle of the cell). ...
Pipe Cleaner Genetics
... 2. Pretend your table is a cell. Use your pipe cleaner chromosomes to model the different phases of mitosis. How many daughter cells did you make? _______ How many chromosomes does each daughter cell have? ______ Are the daughter cells diploid or haploid? _________ Are the genotypes of the daughter ...
... 2. Pretend your table is a cell. Use your pipe cleaner chromosomes to model the different phases of mitosis. How many daughter cells did you make? _______ How many chromosomes does each daughter cell have? ______ Are the daughter cells diploid or haploid? _________ Are the genotypes of the daughter ...
Ch 16 Genetics Review
... and slowly duplicate the chromosomes for another mitotic division. Since this is meiosis, there is a very short interphase and division begins again. The DNA is not doubled ...
... and slowly duplicate the chromosomes for another mitotic division. Since this is meiosis, there is a very short interphase and division begins again. The DNA is not doubled ...
1 A cell in the basal layer of the skin contains 46 chromosomes and
... Cell division and chromosomes exam questions – with answers (continued) 10 A fruit fly has four pairs of chromosomes in its cells. At meiosis, how many different combinations of maternal and paternal chromosomes are possible in the gametes. In gametes derived from a cell with four pairs of chromoso ...
... Cell division and chromosomes exam questions – with answers (continued) 10 A fruit fly has four pairs of chromosomes in its cells. At meiosis, how many different combinations of maternal and paternal chromosomes are possible in the gametes. In gametes derived from a cell with four pairs of chromoso ...
Reproduction - St John Brebeuf
... � Asexual reproduction produces offspring genetically identical to the parent � There are several forms of asexual reproduction, including fission, budding, fragmentation, vegetative, and spore formation � Cloning methods can be used to produce organisms with desired traits ...
... � Asexual reproduction produces offspring genetically identical to the parent � There are several forms of asexual reproduction, including fission, budding, fragmentation, vegetative, and spore formation � Cloning methods can be used to produce organisms with desired traits ...
Division of sex cells
... chromatids of homologous chromosomes exchange genetic information, results in a new combination of genes. ...
... chromatids of homologous chromosomes exchange genetic information, results in a new combination of genes. ...
CA3_Review_and_Sexual_vs_Asexual
... 1. Need two parents, so they “must expend energy” to find, identify (court), and copulate with mate 2. Taking the time to exchange genes is counter productive if conditions are stable 3. Only half the individuals are producing offspring(Males are an energy issue) 4. Slower at passing on genes 5. “Co ...
... 1. Need two parents, so they “must expend energy” to find, identify (court), and copulate with mate 2. Taking the time to exchange genes is counter productive if conditions are stable 3. Only half the individuals are producing offspring(Males are an energy issue) 4. Slower at passing on genes 5. “Co ...
Nedchromosnotes2jan2014NED 20 KB
... condition refer to what? Important terms you need to and should know but I do not have time to redefine because they should be hardwired by now are haploid, diploid, nucleosome, chromatin, histone, centromere, telomere, homologues, chromatids. Bacterial genomes = 4.6 Mb = 4.6 x 10^6 bp Human genome ...
... condition refer to what? Important terms you need to and should know but I do not have time to redefine because they should be hardwired by now are haploid, diploid, nucleosome, chromatin, histone, centromere, telomere, homologues, chromatids. Bacterial genomes = 4.6 Mb = 4.6 x 10^6 bp Human genome ...
C1. Genetic recombination is a term that refers to a new combination
... C17. A tetrad contains four spores; an octad contains eight. In a tetrad, meiosis produces four spores. In an octad, meiosis produces four cells, and then they all go through mitosis to double the number to eight cells. C18. In an unordered ascus, the products of meiosis are free to move around. In ...
... C17. A tetrad contains four spores; an octad contains eight. In a tetrad, meiosis produces four spores. In an octad, meiosis produces four cells, and then they all go through mitosis to double the number to eight cells. C18. In an unordered ascus, the products of meiosis are free to move around. In ...
Document
... C17. A tetrad contains four spores; an octad contains eight. In a tetrad, meiosis produces four spores. In an octad, meiosis produces four cells, and then they all go through mitosis to double the number to eight cells. C18. In an unordered ascus, the products of meiosis are free to move around. In ...
... C17. A tetrad contains four spores; an octad contains eight. In a tetrad, meiosis produces four spores. In an octad, meiosis produces four cells, and then they all go through mitosis to double the number to eight cells. C18. In an unordered ascus, the products of meiosis are free to move around. In ...
Biology Lesson Plans - Paint Valley Local Schools
... HW: Study your Meiosis C-Map so that you can better understand the type of cell division that makes sperm and egg. Ch. 8 Test next Monday. Tuesday, November 19, 2013 Finish Life’s Greatest Miracle Interactive Animations of Mitosis & Meiosis on the SmartBoard 1. Meiosis Only with 4 Q quiz http://www. ...
... HW: Study your Meiosis C-Map so that you can better understand the type of cell division that makes sperm and egg. Ch. 8 Test next Monday. Tuesday, November 19, 2013 Finish Life’s Greatest Miracle Interactive Animations of Mitosis & Meiosis on the SmartBoard 1. Meiosis Only with 4 Q quiz http://www. ...
slides
... When nondisjunc0on happens in meiosis II rather than in meiosis I, the outcome is: a. The same as when it happens in meiosis I b. In meiosis II, all gametes are abnormal, while in meiosis I o ...
... When nondisjunc0on happens in meiosis II rather than in meiosis I, the outcome is: a. The same as when it happens in meiosis I b. In meiosis II, all gametes are abnormal, while in meiosis I o ...
What are the main events of the cell cycle?
... chromatids that are held together by a centromere ...
... chromatids that are held together by a centromere ...
Chapter 12 The Cell Cycle
... special type of reproductive cell that contains only one set of chromosomes (sperm & egg) A special reproductive process that cells use to produce gametes is called meiosis (reduction division) ...
... special type of reproductive cell that contains only one set of chromosomes (sperm & egg) A special reproductive process that cells use to produce gametes is called meiosis (reduction division) ...
1 BI 112 Instructor: Waite Final Unit Practice Exam 1) Which of the
... d) All of the above 3) Mitosis and meiosis both begin with… a) DNA replication b) Chromosomes lining up at the metaphase plate c) Dissolving of the nuclear envelope d) Cytokinesis 4) The purpose of cell cycle checkpoints is… a) To keep cells small b) To make sure that cells are healthy before they d ...
... d) All of the above 3) Mitosis and meiosis both begin with… a) DNA replication b) Chromosomes lining up at the metaphase plate c) Dissolving of the nuclear envelope d) Cytokinesis 4) The purpose of cell cycle checkpoints is… a) To keep cells small b) To make sure that cells are healthy before they d ...
Meiosis and Sexual Life Cycles
... Sister chromatids remain attached at the centromere and move as one unit toward the pole PROPHASE I Sister chromatids ...
... Sister chromatids remain attached at the centromere and move as one unit toward the pole PROPHASE I Sister chromatids ...
Cell Reproduction
... successive nuclear divisions, but the DNA is only copied in ________ of them. Thus, one diploid cell ...
... successive nuclear divisions, but the DNA is only copied in ________ of them. Thus, one diploid cell ...
Chapter 11 Test Study Topics
... - The role of fertilization in determining on organism’s characteristics - Mendel’s seven traits - How alleles are distributed to offspring - The P, F1, and F2 generations - Study Figure 11-3, 11-4, 11-5 Section 11-4: Meiosis Vocabulary to define/give an example: Crossing-over Diploid Haploid Homolo ...
... - The role of fertilization in determining on organism’s characteristics - Mendel’s seven traits - How alleles are distributed to offspring - The P, F1, and F2 generations - Study Figure 11-3, 11-4, 11-5 Section 11-4: Meiosis Vocabulary to define/give an example: Crossing-over Diploid Haploid Homolo ...
chromosomes and meiosis
... Meiosis and sexual reproduction Meiosis is needed to produce sex cells (gametes) with unpaired sets of chromosomes (haploid) Sex cells are used in fertilisation At fertilisation two sets of genes come together to form a hybrid with a set of paired chromosomes (diploid) The hybrid, whilst si ...
... Meiosis and sexual reproduction Meiosis is needed to produce sex cells (gametes) with unpaired sets of chromosomes (haploid) Sex cells are used in fertilisation At fertilisation two sets of genes come together to form a hybrid with a set of paired chromosomes (diploid) The hybrid, whilst si ...
Mitosis and Meiosis
... Last stage of cell cycle In animal cells a cleavage furrow will split the cells into 2 daughter cells. In plant cells, a cell wall or cell plate will form between the two cells. ...
... Last stage of cell cycle In animal cells a cleavage furrow will split the cells into 2 daughter cells. In plant cells, a cell wall or cell plate will form between the two cells. ...
Ch. 6/7 Objectives 1. Identify the different phases of Mitosis and
... Describe differences between Mitosis and Meiosis Identify the products of Meiosis and Mitosis What is the difference between Anaphase I and Anaphase II of meiosis? Define haploid and diploid Define genotype, phenotype, homozygous, heterozygous, dominant, recessive, genetics, heredity, gametes, and z ...
... Describe differences between Mitosis and Meiosis Identify the products of Meiosis and Mitosis What is the difference between Anaphase I and Anaphase II of meiosis? Define haploid and diploid Define genotype, phenotype, homozygous, heterozygous, dominant, recessive, genetics, heredity, gametes, and z ...
Meiosis
Meiosis /maɪˈoʊsɨs/ is a specialized type of cell division which reduces the chromosome number by half. This process occurs in all sexually reproducing single-celled and multi-celled eukaryotes, including animals, plants, and fungi. Errors in meiosis resulting in aneuploidy are the leading known cause of miscarriage and the most frequent genetic cause of developmental disabilities. In meiosis, DNA replication is followed by two rounds of cell division to produce four daughter cells each with half the number of chromosomes as the original parent cell. The two meiotic divisions are known as meiosis I and meiosis II. Before meiosis begins, during S phase of the cell cycle, the DNA of each chromosome is replicated so that it consists of two identical sister chromatids. In meiosis I, homologous chromosomes pair with each other and can exchange genetic material in a process called chromosomal crossover. The homologous chromosomes are then segregated into two new daughter cells, each containing half the number of chromosomes as the parent cell. At the end of meiosis I, sister chromatids remain attached and may differ from one another if crossing-over occurred. In meiosis II, the two cells produced during meiosis I divide again. Sister chromatids segregate from one another to produce four total daughter cells. These cells can mature into various types of gametes such as ova, sperm, spores, or pollen.Because the number of chromosomes is halved during meiosis, gametes can fuse (i.e. fertilization) to form a zygote with a complete chromosome count containing a combination of paternal and maternal chromosomes. Thus, meiosis and fertilization facilitate sexual reproduction with successive generations maintaining the same number of chromosomes. For example, a typical diploid human cell contains 23 pairs of chromosomes (46 total, half of maternal origin and half of paternal origin). Meiosis produces haploid gametes with one set of 23 chromosomes. When two gametes (an egg and a sperm) fuse, the resulting zygote is once again diploid, with the mother and father each contributing 23 chromosomes. This same pattern, but not the same number of chromosomes, occurs in all organisms that utilize meiosis. Thus, if a species has 30 chromosomes in its somatic cells, it will produce gametes with 15 chromosomes.