Warm the slide over the flame of a spirit lamp and then put a blotting paper over, press it smoothly by your thumb. The nuclei also undergo mitosis and form eight haploid nuclei, which then form eight ascospores. Put the stained lobe on a clean slide and cover it with a coverslip.
Then, using the 10 X objective, view the slide and locate a group of hybrid asci. Activity 5 In what respect does each of the following hypothetical breeding experiments produce results that differ in an important way from the results described in the breeding experiment in maize?
The recessive phenotype reappears in the F2 generation.
All of the offspring have pink flowers. Question 11 What are the phenotypes corresponding to each of the genotypes, GG, Gg and gg of the F2 generation? Sordaria form a set of eight ascospores called an Mitosis and meiosis experiment.
Polytene chromosome is one of the giant chromosomes found in animals and plants. Examine the slide carefully and note various stages of meiosis.
Anaphase begins when the chromatids are separated and pulled to opposite poles. The cells and their chromosomes are spread out and become distinct. In plants mitosis takes place in the meristems which are normally found at the tips of stems or roots.
Answer The results of Experiment Mitosis and meiosis experiment differ from those we have described for maize because in this experiment the character that vanishes in the first offspring generation is the one that reappears in about three-quarters of the individuals in the second generation.
Then press the thorax with a needle and observe that the salivary glands are seen floating in the saling water on the slide. The root tips contain an area called the apical meristem that has the highest percentage of cells undergoing mitosis.
Somatic body cells divide exclusively by mitosis followed by cytokinesis, while germ cells produce gametes by the process of meiosis. Thus, for example, the top left-hand box records the outcome of fertilisation between a G ovule and a G pollen grain.
In an animal cells a cleavage furrow forms and the cell pinches off into two new daughter cells. DNA replication does not take place in interphase II. Anyone can learn for free on OpenLearn but creating an account lets you set up a personal learning profile which tracks your course progress and gives you access to Statements of Participation and digital badges you earn along the way.
Materials The materials used in this exercise were chromosome simulation kits containing four strands of beads. Observe carefully for 3rd instar larvae which will be white coloured. Methods To show the process of interphase place one strand of each color near the center of your work area.
Wash the sections in distilled water twice and then in tap-water for at-least 30 minutes. Calculate the distance, in map units, between a specific gene and the chromosome centromere.
The nuclear components are stained in deep blue colour and cytoplasm in orange colour. When the pollen from pure-breeding white-flowered plants fertilises the ovules of pure-breeding red-flowered plants, all of the offspring have red flowers.
Take a drop of acetocarmine on a clean microscopic slide and put on it one or two root tips. Most of the time cytokinesis and formation of the nuclear envelope occur in order two make to cells. About three-quarters of their offspring have white flowers, and about one-quarter have red flowers.
The phenotype of each of these genotypes in the F2 generation can be determined since we know that the allele G purple grain is dominant to g. Now consider the possible fertilisations between the gametes produced by the F1 generation, as shown in Figure 8, and the genotypes and phenotypes of the F2 generation that arises from these fertilisations.
Identify one cell that clearly represents each phase. Metaphase I moves the tetrads to the metaphase plate in the middle of the cell, and Anaphase I reduces the tetrads to their original two stranded form and moves them to opposite poles.
Take a small specimen jar.
Cool it and add in pulp of fruits prepared. By the time the cell has reached metaphase the chromosomes have moved to the center of the mitotic spindle. Mitosis is the first of these studied in this lab.
Take a chloroformed grasshopper and dissect it in normal saline. Note down in each case how the results differ. A precursor to mitosis is interphase.Mitosis & Meiosis -AP lab 3.
Introduction Cells come from preexisting cells.
New cells are formed during cell division which involves both replication of the cell’s nucleus, karyokinesis, and division of the cytoplasm, cytokinesis. Product Description Pre-Lab Questions ”1.
What are chromosomes made of?” ”2. Compare and contrast mitosis and meiosis. ” ”3. Cancer is a disease related to uncontrolled cell division. Lab #3: Mitosis and Meiosis To investigate the processes of mitosis and meiosis.
Cells come from previous existing cells. New cells are formed by cell division, which involves karyokinesis and cytokinesis. View Mitosis and Meiosis Experiment 4 from BIO at Jefferson Community and Technical College.
Crossing Over The process, during meiosis I, by which two, paired homologous chromosomes are paired%(2). Meiosis is a specialized type of cell division sharing many features with mitosis.
The main difference is that meiosis involves two successive nuclear divisions that produces four. Nov 22, · Mr. Andersen uses chromosome beads to simulate both mitosis and meiosis. A brief discussion of gamete formation is .Download