Beadle and Tatum: Why was Neurospora a suitable choice as an experimental organism? It is easy to obtain and use in a laboratory, mutants are easily obtained by X-ray or UV radiation, new generations can be produced in relatively short time frames, having a haploid genome means any mutation appears in the phenotype and it is easy to control variables for growth, e.g. temperature, food supplies etc. Distinguish between minimal medium and complete medium. Minimal medium is the basic food supply that is needed to support the wild-type mould.
Species is the only rank not defined by scientists. A species is defined by a natural process – mating to produce fertile offspring. 3. Which category has more biological meaning – all brown birds or all birds descended from a hawk-like ancestor? Why?
4 c. 6 d. 8 2. In the homologous pair of chromosomes above, which of the following is a gene? e. Earthworm tasting ability f. One thumb g. Both of the above h. None of the above 3. In the homologous pair of chromosomes above, which of the following is an allele? i. Earthworm tasting ability j.
They thus contain only half of the genetic material common to the animal's cells and have not yet undergone any development. 3. Removal of Egg's Nucleus As the genetic material that is present in the egg cells is not what scientists want the cloned animal to have, and as having multiple nuclei in the same cell can cause many problems for the cloning process, scientists must extract the egg cell's nucleus. They do this through a method similar to the method used to isolate the donor cell's nucleus, only they discard the egg's
3) What does the taproot system do? Often stores organic nutrients that the plant consumes during flowering and fruit production. 4) Why are root crops such as carrots, turnips, and sugar beets harvested before they flower? Because the taproot system stores organic nutrients in the root part. 5) What is the system where no roots stand out as the main one?
Research Methods A. Experimental Method 1. Know the difference between independent and dependent variable 2. It’s the only method that can discuss causation 3. Why is operational definition or procedure important?
The test statistic is used to determine whether the researcher should use the null or alternative hypothesis. The third step is to state the conditions that will accept or reject the null hypothesis and identify the critical value for the test statistic. The critical value separates the non-reject region from the reject region ("Test Of Hypothesis", 2014). The fourth step is to compute the appropriate test statistic and compare it with the critical value. The null hypothesis is rejected if the computed
Water leaves the finest veins and enters the cells of the spongy and palisade layers. Some of the water may be used in metabolism, but most is lost in transpiration. (http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/X/Xylem.html) QUESTION 4 4.1. Monocot • Because monocot have a single cotyledon or seed leaf whereas the Eudicot seed have two cotyledons. • Monocot flowers have petals and other floral parts in multiple of three and Eudicot have four or five floral parts or multiple.
C. have no effect on ovulation. D. lead to an increase in sperm production. Incorrect Points Earned: 0/1 Correct Answer: A Your Response: C 3. Who determines the baby's sex? A. neither parent in particular B. the father C. both parents D. the mother Correct Points Earned: 1/1 Correct Answer: B Your Response: B 4. The cephalocaudal principle of development refers to the fact that prenatal development proceeds from: A. the trunk of the body towards the extremities.
Holoparasite – a plant that is completely parasitic on other plants and has virtually no chlorophyll. * 3b. Hemiparasite – a plant that is parasitic under natural conditions and is also photosynthetic to some degree. Hemiparasites may just obtain water and mineral nutrients from the host plant. Many obtain at least part of their organic nutrients from the host as well.