1. Plant breeders wanted to produce a better variety of tomato by selective breeding. Two plants‚ of the varieties Tangella and Piranto‚ were crossed. (a) Some flowers of each variety were covered with cellophane bags. The diagram shows a covered flower and a brush. (i) Explain why some flowers were covered with cellophane bags during the selective breeding. .......................................................................................................................... ........
Premium DNA Gene Bacteria
1859 Charles Darwin published the "On the Origin of Species"‚ introducing that genetic evolution allowed adaptation over time to produce organisms best suited to the environment 1865 Gregor Mendel investigated "traits" passed from parents to prodigy and coined the terms dominant and recessive traits 1869 Johann Meisher isolated DNA from the nuclei of white blood cells 1875 Charles Darwin introduced "gemmules" as mechanism of inheritance 1902 Walter Sutton created
Premium DNA
Which is bigger‚ a rhinovirus or E. Coli? E. Coli 3. Based on the magnification‚ how many of the E. Coli can fit into the same space as the head of a pin? 10‚000 E. Coli 4. About how many red blood cells could fit across the diameter of a human hair (again‚ look at the magnification scale)? about 100 blood cells? Experiment 2: Virtual Microscope 1. What is the first step normally taken when you look through the oculars? Adjust Oculars 2. What is the highest objective you
Premium Cell nucleus Lens Red blood cell
Biology- Maintaining a Balance Summary 1. Most organisms are active in a limited temperature range 1. identify the role of enzymes in metabolism‚ describe their chemical composition and use a simple model to describe their specificity on substrates Enzymes are proteins which act as catalysts in living things (they lower the amount of energy needed for a reaction‚ therefore increasing rate of reaction). Enzymes speed up reactions but are not used up by them. Enzymes catalyze only one
Premium Blood Carbon dioxide
is the difference between a benign and a malignant tumor? - Benign tumors do not metastasize; malignant tumors do 20) Which of the following will help prevent cancer and increase survival? - Seek early detection of tumors 21)+++ This diagram of the human life cycle shows that ______. - meiosis produces haploid sperm and egg cells 22)+++ The following figure shows that ______ - meiosis results in the formation of four haploid daughter cells 23) The karyotype below
Premium DNA Meiosis Chromosome
evoluAon of: • Movement of land mammals to ocean; • Feathers & flight in birds; • Vascular Assue in plants; • Upright posture & large brains in humans; • Jaws in vertebrates (animals w backbone) • Tetrapod limb (movement from water to land) aquaAc ‘fishapod’ Evidence: spp are related (common
Premium Genetics
rhinovirus or E. Coli? Answer: E. Coli 3. Based on the magnification‚ how many of the E. Coli can fit into the same space as the head of a pin? Answer: 2 Micrometers 4. About how many red blood cells could fit across the diameter of a human hair (again‚ look at the magnification scale)? Answer: 20 micrometers Experiment 2: Virtual Microscope Post-Lab Questions 1. After completing the m1 exercise in the “Try this” section‚ how tall is the letter e? Answer: about 1.8micrometers
Premium Cell nucleus Red blood cell Lens
Question 1 2 out of 2 points Which of the following statements about meiosis is true? Selected Answer: a. The chromosome number in the resulting cells is halved. Question 2 2 out of 2 points The mitotic spindle Selected Answer: e. is composed of two different types of microtubules. Question 3 2 out of 2 points A chromatid is Selected Answer: e. one-half of a newly replicated eukaryotic chromosome. Question 4 2
Premium Management Marketing Balance sheet
AP ESSAY ANSWERS: 16-20 1. Information transfer is fundamental to all living organisms. For TWO of the following examples‚ explain in detail‚ how the transfer of information is accomplished. A) The genetic material in one eukaryotic cell is copied and distributed to two identical daughter cells. B) A gene in a eukaryotic cell is transcribed and translated to produce a protein. C) The genetic material from one bacterial cell enters another via transformation‚ transduction or conjugation
Premium DNA
Is gene therapy the most effective way to treat depression? What really is depression? The term ‘depression’ can be defined in two different ways: 1. Severe despondency and dejection‚ accompanied by feelings of hopelessness and inadequacy. 2. A condition of mental disturbance‚ typically with lack of energy and difficulty in maintaining concentration or interest in life.1 Majority of people believe that depression is somewhat trivial and is not regarded as a genuine health condition‚ but
Premium DNA Gene Genetic disorder