ClDvGent - GEOCITIES.ws
... separate. The spindle fibers pull one chromatid to either side of the cell. The cell becomes stretched as opposite ends pull apart. (make a sketch of this phase) ...
... separate. The spindle fibers pull one chromatid to either side of the cell. The cell becomes stretched as opposite ends pull apart. (make a sketch of this phase) ...
Recombination - CCGB | index
... molecules to produce new DNA molecules • Reciprocal recombination: new DNA molecules carry genetic information from both parental molecules. • Gene conversion: one way transfer of information, resulting in an allele on one parental chromosome being changed to the allele from the other homologous chr ...
... molecules to produce new DNA molecules • Reciprocal recombination: new DNA molecules carry genetic information from both parental molecules. • Gene conversion: one way transfer of information, resulting in an allele on one parental chromosome being changed to the allele from the other homologous chr ...
Keywords - NCEA Level 2 Biology
... A sex linked condition on the Y chromosome will not show in females. XY’ X linked recessive traits show up more in males as they only have one X chromosome so if they gain that allele from their mother, they will have that trait. X’Y For a female to show an X linked trait they must have two copies o ...
... A sex linked condition on the Y chromosome will not show in females. XY’ X linked recessive traits show up more in males as they only have one X chromosome so if they gain that allele from their mother, they will have that trait. X’Y For a female to show an X linked trait they must have two copies o ...
Unit 11 Human Genetics
... e. Phenylketonuria (PKU) is inherited as recessive autosomal gene. PKU leads to the inability to break down the amino acid phenylalanine when ingested. The phenylalanine builds up in the brain and leads to decreased mental function. PKU is unique because, if detected early, it can be entirely contr ...
... e. Phenylketonuria (PKU) is inherited as recessive autosomal gene. PKU leads to the inability to break down the amino acid phenylalanine when ingested. The phenylalanine builds up in the brain and leads to decreased mental function. PKU is unique because, if detected early, it can be entirely contr ...
Meiosis - NIU Department of Biological Sciences
... • Go from 1 cell to 2 cells. Each daughter cell contains 1 copy of each chromosome: they are haploid, with the chromosomes still having 2 chromatids each. • For humans: start with one cell containing 46 chromosomes (23 pairs) to 2 cells containing 23 chromosomes. • As a result of crossing over, each ...
... • Go from 1 cell to 2 cells. Each daughter cell contains 1 copy of each chromosome: they are haploid, with the chromosomes still having 2 chromatids each. • For humans: start with one cell containing 46 chromosomes (23 pairs) to 2 cells containing 23 chromosomes. • As a result of crossing over, each ...
Meiosis - WordPress.com
... • Go from 1 cell to 2 cells. Each daughter cell contains 1 copy of each chromosome: they are haploid, with the chromosomes still having 2 chromatids each. • For humans: start with one cell containing 46 chromosomes (23 pairs) to 2 cells containing 23 chromosomes. • As a result of crossing over, each ...
... • Go from 1 cell to 2 cells. Each daughter cell contains 1 copy of each chromosome: they are haploid, with the chromosomes still having 2 chromatids each. • For humans: start with one cell containing 46 chromosomes (23 pairs) to 2 cells containing 23 chromosomes. • As a result of crossing over, each ...
Name - Mr. Spechts world of Science
... particular trait, and two offspring are produced. The first offspring exhibits the dominant trait. What is the probability that the second offspring will exhibit the recessive trait? ...
... particular trait, and two offspring are produced. The first offspring exhibits the dominant trait. What is the probability that the second offspring will exhibit the recessive trait? ...
The Fifties and the Renaissance in Human and
... potent mitogen for human peripheral blood lymphocytes; this made it possible to do a chromosome study on virtually anyone, using only a few drops of blood instead of a tissue or bone marrow biopsy. The demonstration by STEELE and BREG ( 1966) thatamniotic fluid cells could be grown in culture and ka ...
... potent mitogen for human peripheral blood lymphocytes; this made it possible to do a chromosome study on virtually anyone, using only a few drops of blood instead of a tissue or bone marrow biopsy. The demonstration by STEELE and BREG ( 1966) thatamniotic fluid cells could be grown in culture and ka ...
BLM 2-30, Compare the Events of Meiosis and Mitosis Key Meiosis I
... each pole of the cell (one chromosome for each pair) the spindle fibres disappear the nucleolus appears within each nucleus the nuclear membrane forms ...
... each pole of the cell (one chromosome for each pair) the spindle fibres disappear the nucleolus appears within each nucleus the nuclear membrane forms ...
chapt04_lecture
... • Each new DNA helix winds around new histones formed in the cytoplasm to form nucleosomes • 46 chromosomes replicated in 6-8 hours by 1000’s of polymerase molecules ...
... • Each new DNA helix winds around new histones formed in the cytoplasm to form nucleosomes • 46 chromosomes replicated in 6-8 hours by 1000’s of polymerase molecules ...
Ch 11 Notes - Intro to Genetics
... to generation, the sex cells have to reduce the number of chromosomes to one half of the number that you find in a somatic cell (body cell) • Meiosis is the process that reduces the number of chromosomes to 1/2. ...
... to generation, the sex cells have to reduce the number of chromosomes to one half of the number that you find in a somatic cell (body cell) • Meiosis is the process that reduces the number of chromosomes to 1/2. ...
HT180_Presentation
... Involves creation of several in vitro embryos from the eggs and sperm of a couple Embryos develop to a 6-10 cell stage, at which point one of the embryonic cells is removed and the cellular DNA is analyzed for chromosomal abnormalities Embryos free of genetic abnormalities are subsequently transf ...
... Involves creation of several in vitro embryos from the eggs and sperm of a couple Embryos develop to a 6-10 cell stage, at which point one of the embryonic cells is removed and the cellular DNA is analyzed for chromosomal abnormalities Embryos free of genetic abnormalities are subsequently transf ...
BIO152 Course in Review
... ‘Recipe’ for life is based on DNA; all life shares the same basic machinery for inheritance ...
... ‘Recipe’ for life is based on DNA; all life shares the same basic machinery for inheritance ...
Chapter 15 Answers to Even Numbered Study Questions
... amoebaflagellates, and apicomplexans. Dinoflagellates can also cause disease by producing a toxin, but they themselves are not pathogens. (Note: a several other groups contain human pathogens; only those that are mentioned in this chapter are included here.) 6. The ciliate micronucleus contains a di ...
... amoebaflagellates, and apicomplexans. Dinoflagellates can also cause disease by producing a toxin, but they themselves are not pathogens. (Note: a several other groups contain human pathogens; only those that are mentioned in this chapter are included here.) 6. The ciliate micronucleus contains a di ...
Unit 1: Cells - Loudoun County Public Schools
... 5. You should be able to define and utilize the following important terminology of genetics a) gene- section of DNA that carries a trait b) allele- as a form of a gene. c)dominant- a trait, that when present will be seen d) recessive- a trait that will only be seen when it is the only one present e ...
... 5. You should be able to define and utilize the following important terminology of genetics a) gene- section of DNA that carries a trait b) allele- as a form of a gene. c)dominant- a trait, that when present will be seen d) recessive- a trait that will only be seen when it is the only one present e ...
EOC Review Powerpoint
... Which process most contributes to genetic variation in a population? Crossing over during meiosis Chromsome replication during mitosis ...
... Which process most contributes to genetic variation in a population? Crossing over during meiosis Chromsome replication during mitosis ...
EXAM EXPECTATIONS MYP Biology
... DESCRIBE ways in which a person could get XYY chromosomes COMPARE cell division between animal and plant cells COMPARE mitosis and meiosis COMPARE somatic cells and gametes COMPARE benign and malignant tumors COMPARE eukaryotic and prokaryotic chromosomes COMPARE the genes of siblings, of identical ...
... DESCRIBE ways in which a person could get XYY chromosomes COMPARE cell division between animal and plant cells COMPARE mitosis and meiosis COMPARE somatic cells and gametes COMPARE benign and malignant tumors COMPARE eukaryotic and prokaryotic chromosomes COMPARE the genes of siblings, of identical ...
Sources of Genetic Variation
... hereditary traits. Each traits determined by pair of factors. 1869 - Friedrich Miescher isolates DNA for the first time, names it nuclein. 1882 – Walther Flemming describes threadlike ’chromatin’ in the nucleus that turns red with staining, studied and named mitosis. The term ‘chromosome’ used by He ...
... hereditary traits. Each traits determined by pair of factors. 1869 - Friedrich Miescher isolates DNA for the first time, names it nuclein. 1882 – Walther Flemming describes threadlike ’chromatin’ in the nucleus that turns red with staining, studied and named mitosis. The term ‘chromosome’ used by He ...
Honors Biology
... c. Chickens have 3 different feather-color combinations. Chickens with all black feathers are homozygous for the black allele. Chickens with all white feathers are homozygous for the white allele. Chickens that have both black and white feathers are heterozygous. Cross a black male with a white fema ...
... c. Chickens have 3 different feather-color combinations. Chickens with all black feathers are homozygous for the black allele. Chickens with all white feathers are homozygous for the white allele. Chickens that have both black and white feathers are heterozygous. Cross a black male with a white fema ...
Taxonomy - Cloudfront.net
... What is morphology and how can it be used to help classify organisms? What are homologous structures and how is it used to help classification? How can molecular evidence like DNA and chromosomes be used to classify life? What does it mean if two different organisms develop along similar pattern? Di ...
... What is morphology and how can it be used to help classify organisms? What are homologous structures and how is it used to help classification? How can molecular evidence like DNA and chromosomes be used to classify life? What does it mean if two different organisms develop along similar pattern? Di ...
Chromosome
A chromosome (chromo- + -some) is a packaged and organized structure containing most of the DNA of a living organism. It is not usually found on its own, but rather is complexed with many structural proteins called histones as well as associated transcription (copying of genetic sequences) factors and several other macromolecules. Two ""sister"" chromatids (half a chromosome) join together at a protein junction called a centromere. Chromosomes are normally visible under a light microscope only when the cell is undergoing mitosis. Even then, the full chromosome containing both joined sister chromatids becomes visible only during a sequence of mitosis known as metaphase (when chromosomes align together, attached to the mitotic spindle and prepare to divide). This DNA and its associated proteins and macromolecules is collectively known as chromatin, which is further packaged along with its associated molecules into a discrete structure called a nucleosome. Chromatin is present in most cells, with a few exceptions - erythrocytes for example. Occurring only in the nucleus of eukaryotic cells, chromatin composes the vast majority of all DNA, except for a small amount inherited maternally which is found in mitochondria. In prokaryotic cells, chromatin occurs free-floating in cytoplasm, as these cells lack organelles and a defined nucleus. The main information-carrying macromolecule is a single piece of coiled double-stranded DNA, containing many genes, regulatory elements and other noncoding DNA. The DNA-bound macromolecules are proteins, which serve to package the DNA and control its functions. Chromosomes vary widely between different organisms. Some species such as certain bacteria also contain plasmids or other extrachromosomal DNA. These are circular structures in the cytoplasm which contain cellular DNA and play a role in horizontal gene transfer.Compaction of the duplicated chromosomes during cell division (mitosis or meiosis) results either in a four-arm structure (pictured to the right) if the centromere is located in the middle of the chromosome or a two-arm structure if the centromere is located near one of the ends. Chromosomal recombination during meiosis and subsequent sexual reproduction plays a vital role in genetic diversity. If these structures are manipulated incorrectly, through processes known as chromosomal instability and translocation, the cell may undergo mitotic catastrophe and die, or it may unexpectedly evade apoptosis leading to the progression of cancer.In prokaryotes (see nucleoids) and viruses, the DNA is often densely packed and organized. In the case of archaea by homologs to eukaryotic histones, in the case of bacteria by histone-like proteins. Small circular genomes called plasmids are often found in bacteria and also in mitochondria and chloroplasts, reflecting their bacterial origins.