UNIT I In an observational test one has no control over the independent variable. In an experiment there is an independent and dependent variable‚ and one has control over the independent variable Dependent variable: value depends on that of another‚ what is causing result‚ what you measured. Independent variable: value does NOT depend on that of another Ex: Effect flower color 0n attraction of bees. Ind: flower color‚ Dep: what result is Properties of Life: order‚ evolutionary adaptation‚ response
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2.7.- COMPARACION ENTRE LAS CELULAS Recuerda que las celulas procarionticas son celulas primitovas que no tienen organelos rodeados por membranas. Su material nuclear se encuentra flotando en el citoplasma. Las bacterias se clasifican como procariontas. Las celulas eucariontas son las mas avanzadas y contienen organelos rodeados por membranas. Su material nuclear esta rodeado por una membrane nuclear. Las celulas de las plantas‚ los hongos y los animals son eucarionticas. Las celulas de las plantas
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Reproductive System Function: Anatomy of Male Reproductive System Major Organs producing offspring External Reproductive Organs propagation of the species penis and scrotum !in terms of evolution – the only reason all the other systems exist Internal Organs: only major system that doesn’t work continuously ! only activated at puberty these structures form continuous tube: Testes epididymus vas deferens ejaculatory duct urethra in penis unlike most other organisms
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Mendelian inheritance Mendelian inheritance (or Mendelian genetics or Mendelism or Monogenetic inheritance) is a scientific theory of how hereditary characteristics are passed from parent organisms to their offspring; it underlies much of genetics. This theoretical framework was initially derived from the work of Gregor Johann Mendel published in 1865 and 1866 which was re-discovered in 1900; it was initially very controversial. When Mendel’s theories were integrated with the chromosome theory of
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means of meiosis‚ distinctly cyclic event that normally releases one egg each month‚ accompanied by cyclic changes in hormone secretion‚ and cyclic changes in histological structure of the ovaries and uterus. Egg development resumes in adolescence. Embryonic development of ovary: female germ cells arise from yolk sac‚ colonize gonadal ridges the first 5 to 6 weeks of development‚ differentiate into oogonia and multiply until the fifth month‚ transform into primary oocytes: early meiosis I‚ most degenerate
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Interkinesis - Chromosome still consist of two chromatids 2. Mitosis is simple cell division‚ two identical cells. Meiosis is cell division for gametes (sex cells). from parents. 3. Gametes are haploid. 4. Fertilized egg is called a zygote. 5. Another name for a tetrad was a bivalent. Synaptonemal complex is a protein structure that forms between two homologous chromosomes during meiosis. Chiasma is the point where two homologous non-sister chromatids exchange genetic material. Crossing over occurs
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most eukaryotes‚ recombination analysis cannot be used to map the loci of centromeres‚ because they show no heterozygosity that enable them to be used as markers (Griffiths‚ A.‚ 2005). Also‚ it is difficult to observe all the results of a single meiosis. However‚ certain fungi can produce linear tetrads and centromeres can be mapped. Once such fungus Sordaria fimicola. The spores from Sordaria fimicola divide mitotically to replicate their nuclei but do not complete cytokinesis. This gives rise
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about 1–2 million oocytes. In oocytes the first meiotic division (meiosis I) will initiated and then stopped. No further development occurs until the girl becomes sexually mature. After maturity the primary oocytes recommence their development‚ usually one at a time and once a month. The primary oocyte grows further and completes the meiosis I‚ forming a large secondary oocyte and a small polar body. Only after fertilization meiosis II will be completed. By completion of
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Discuss the Male Reproductive System The reproductive system is questionably the body system that is the most important influence on life as we know it. It is the w ay in which we procreate and ensure our existence as a species. However‚ the penis is only one part of the male reproductive system‚ which constitutes of a series responsible for generating‚ storing‚ and transporting the genetic material contained in the sperm cells. The main organs include: testicles (or testes)‚ the epididymides
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Know definitions of the words used for Meiosis‚ Mendel’s work and Genetics Dominant – expression that is always expressed when its gene recessive - An expression that is expressed only when its allele is the only form of the gene present in the genotype. incomplete dominance - Neither allele is dominant to the other‚ thus each is expressed in the heterozygous genotype producing an intermediate phenotype. EX. Red (RR) and White (R’R’) snapdragons produce pink (RR’). epistasis - A condition
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