Mitosis PPT
... All cells grow and divide at different rates. For example, skin cells rapidly and continuously divide throughout life, while nerve cells almost never divide after development. Cyclins are proteins which regulate division and growth in eukaryotic cells. They respond to internal or external cell condi ...
... All cells grow and divide at different rates. For example, skin cells rapidly and continuously divide throughout life, while nerve cells almost never divide after development. Cyclins are proteins which regulate division and growth in eukaryotic cells. They respond to internal or external cell condi ...
Meiosis I
... number from diploid to haploid • Meiosis I – Prophase I key events • The nuclear membrane dissolves. • Chromatin tightly coils up. • Homologous chromosomes, each composed of two sister chromatids, come together in pairs in a process called synapsis. • During synapsis, chromatids of homologous chromo ...
... number from diploid to haploid • Meiosis I – Prophase I key events • The nuclear membrane dissolves. • Chromatin tightly coils up. • Homologous chromosomes, each composed of two sister chromatids, come together in pairs in a process called synapsis. • During synapsis, chromatids of homologous chromo ...
AIMS REVIEW QUESTIONS
... components of their _________________. 91. Organic compounds always contain ________________ and ________________. 92. ___________________ (aka: _________________) are organisms that make their own energy, while _________________ (aka: _________________) must consume other organisms for their energy ...
... components of their _________________. 91. Organic compounds always contain ________________ and ________________. 92. ___________________ (aka: _________________) are organisms that make their own energy, while _________________ (aka: _________________) must consume other organisms for their energy ...
Lecture 2a: Sex: Chromosomes
... Homogametic sex - that sex containing two like sex chromosomes. In most animals species these are females (XX); in butterflies and birds, ZZ males. Heterogametic sex - that sex containing two different sex chromosomes. In most animal species these are XY males. In butterflies and birds, ZW females; ...
... Homogametic sex - that sex containing two like sex chromosomes. In most animals species these are females (XX); in butterflies and birds, ZZ males. Heterogametic sex - that sex containing two different sex chromosomes. In most animal species these are XY males. In butterflies and birds, ZW females; ...
Mitosis
... 30. Males with Klinefelter syndrome have an extra ___________ chromosome (karyotype 47,XXY). 31. Sickle cell anemia is a disorder that involves ___________________ alleles and it results in production of abnormal ______ ______________ _________. 32. What does the following picture show? ____________ ...
... 30. Males with Klinefelter syndrome have an extra ___________ chromosome (karyotype 47,XXY). 31. Sickle cell anemia is a disorder that involves ___________________ alleles and it results in production of abnormal ______ ______________ _________. 32. What does the following picture show? ____________ ...
Document
... plays a role in chromosome movement during mitosis. Centromere B. Metaphase: The second stage of mitosis. * During ______________, the chromosomes move to the equator of the spindle Sister Chromatids C. Anaphase: The third stage of mitosis. * During _______________, the centromeres split and the sis ...
... plays a role in chromosome movement during mitosis. Centromere B. Metaphase: The second stage of mitosis. * During ______________, the chromosomes move to the equator of the spindle Sister Chromatids C. Anaphase: The third stage of mitosis. * During _______________, the centromeres split and the sis ...
The Chromosomal Basis of Inheritance
... through meiosis and fertilization But how does genetic recombination occur at all then?? ...
... through meiosis and fertilization But how does genetic recombination occur at all then?? ...
Chapter 9
... The following is a list of the main themes covered in this chapter and some study objectives. As you study, focus on these areas. Understand how the information you study fits into these themes and how these themes relate to each other. Be sure you master each objective before moving on. 1. Genetics ...
... The following is a list of the main themes covered in this chapter and some study objectives. As you study, focus on these areas. Understand how the information you study fits into these themes and how these themes relate to each other. Be sure you master each objective before moving on. 1. Genetics ...
Learning objectives: • Define the terms `Gene` and `Chromosome
... What is a Chromosome? ! ! All our genetic information is held within the DNA. ! Genes are sections of DNA that code for specific ...
... What is a Chromosome? ! ! All our genetic information is held within the DNA. ! Genes are sections of DNA that code for specific ...
Notes - marric
... Why Does Crossing Over Occur? To provide genetic variation during meiosis Its Why You and I Don’t Look Alike Crossing Over ensures a ____________________ of the maternal and paternal genes we inherited The History of Crossing Over ...
... Why Does Crossing Over Occur? To provide genetic variation during meiosis Its Why You and I Don’t Look Alike Crossing Over ensures a ____________________ of the maternal and paternal genes we inherited The History of Crossing Over ...
Chapter 9
... appear to share a centromere. In fact, the centromere has been replicated but the 2 centromeres are held together by cohesin proteins. Proteins of the kinetochore are attached to the centromere. Microtubules attach to the kinetochore. ...
... appear to share a centromere. In fact, the centromere has been replicated but the 2 centromeres are held together by cohesin proteins. Proteins of the kinetochore are attached to the centromere. Microtubules attach to the kinetochore. ...
Name
... interphase. 2. Together, the G1 phase, S phase, and G2 phase are called interphase. 3. What happens during each phase of interphase? a. G1 – growth and Normal life processes occur b. S – DNA replicates (The structure that holds 2 sister chromatids together is called centromere) c. G2 – chromosomes c ...
... interphase. 2. Together, the G1 phase, S phase, and G2 phase are called interphase. 3. What happens during each phase of interphase? a. G1 – growth and Normal life processes occur b. S – DNA replicates (The structure that holds 2 sister chromatids together is called centromere) c. G2 – chromosomes c ...
GENETIC ABNORMALITIES
... nonfunctional or stops working 1. PKU: lack of enzyme to breakdown amino acid phenylalinine 2. Diabetes: insulin production stops 3. Huntington’s Chorea: nerve deterioration 4. Cystic Fibrosis: pancreas fails to make enzymes needed to breakdown foods ...
... nonfunctional or stops working 1. PKU: lack of enzyme to breakdown amino acid phenylalinine 2. Diabetes: insulin production stops 3. Huntington’s Chorea: nerve deterioration 4. Cystic Fibrosis: pancreas fails to make enzymes needed to breakdown foods ...
Biology Study Guide - Jackson School District
... 4. List the phases of mitosis. What happens during each phase? ...
... 4. List the phases of mitosis. What happens during each phase? ...
Spindle fibers
... 14. How many daughter cells are created from mitosis and cytokinesis? two 15. During what phase does cytokinesis begin? telophase 16. If a human cell has 46 chromosomes, how many chromosomes will be in each daughter cell? 46 17. If a dog cell has 72 chromosomes, how many daughter cells will be creat ...
... 14. How many daughter cells are created from mitosis and cytokinesis? two 15. During what phase does cytokinesis begin? telophase 16. If a human cell has 46 chromosomes, how many chromosomes will be in each daughter cell? 46 17. If a dog cell has 72 chromosomes, how many daughter cells will be creat ...
Cell Growth and Division
... center of the cell on an imaginary line called the metaphase plate. - Microtubules attach to the centromere of each chromosome from both poles of the spindle. ...
... center of the cell on an imaginary line called the metaphase plate. - Microtubules attach to the centromere of each chromosome from both poles of the spindle. ...
Micro Lab Unit 1 Flashcards
... reproduce by another form of mitosis called what? 5) The cell cycle is divided into two main phases, which are? 6) What is the longest phase of the cell cycle? 7) What are the three phases that interphase is subdivided into? 8) During what interphase period are most cells arrested? 9) During what in ...
... reproduce by another form of mitosis called what? 5) The cell cycle is divided into two main phases, which are? 6) What is the longest phase of the cell cycle? 7) What are the three phases that interphase is subdivided into? 8) During what interphase period are most cells arrested? 9) During what in ...
1. Watch this video and explain the process of MEIOSIS.
... becomes double, consisting in two identical strands of DNA. There are two divisions, Meiosis I which halves the number of chromosomes and meiosis II, where the sister chromatids split. The end result is 4 haploid cells. Meiosis I begins with prophase I where individual replicated chromosomes (identi ...
... becomes double, consisting in two identical strands of DNA. There are two divisions, Meiosis I which halves the number of chromosomes and meiosis II, where the sister chromatids split. The end result is 4 haploid cells. Meiosis I begins with prophase I where individual replicated chromosomes (identi ...
Heredity
... DNA polymerase -genetic engineering meiosis co dominance DNA profiling DNA (semiconservative) replication phenotype autosome incomplete dominance pedigree plasmid karyotype complete dominance mRNA gene therapy nucleotide tRNA haploid polygenic recessive inheritancemutation – gene mutation – chromoso ...
... DNA polymerase -genetic engineering meiosis co dominance DNA profiling DNA (semiconservative) replication phenotype autosome incomplete dominance pedigree plasmid karyotype complete dominance mRNA gene therapy nucleotide tRNA haploid polygenic recessive inheritancemutation – gene mutation – chromoso ...
Chapter 8 Cell Reproduction
... Sexual reproduction is the production of offspring through meiosis and then the union of sperm and egg. Offspring produced by sexual reproduction are genetically different from their parents. Identical twins carry identical DNA. New combinations of genes are beneficial. ...
... Sexual reproduction is the production of offspring through meiosis and then the union of sperm and egg. Offspring produced by sexual reproduction are genetically different from their parents. Identical twins carry identical DNA. New combinations of genes are beneficial. ...
Mendel's genetics - Klahowya Secondary School
... attached to a spindle fiber Spindle fibers pull the tetrads into the middle of the equator of the spindle Homologous chromosome line up side by side as tetrads (in mitosis they line up independently) Anaphase I Homologous chromosomes each with its 2 chromatids separate move to opposite ends of the c ...
... attached to a spindle fiber Spindle fibers pull the tetrads into the middle of the equator of the spindle Homologous chromosome line up side by side as tetrads (in mitosis they line up independently) Anaphase I Homologous chromosomes each with its 2 chromatids separate move to opposite ends of the c ...
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.