crosses with observance to recombination. This experiment performed extended over a three week period. The strains that were used from S. fimicola were wild type producing black‚ and mutants producing grey and tan strains. There are seven possible phenotypes as a result from second division segregations through the dihybrid crosses. Map units were found through results of the monohybrid cross. Expected map unit results are 33 mu for grey and 28 mu for tan. However‚ our results differ from that expected
Premium Gene
In this lab‚ you will model the distribution of alleles‚ calculate the probabilities of specific allele combinations‚ and compare them to those that Gregor Mendel found in his work. PROBLEM What is the probability that certain genotypes and phenotypes will occur? MATERIALS 2 pennies 4 cm masking tape marker one folded‚ 3" × 5" index card with a monohybrid cross on it (e.g.‚ Aa × aa‚ or AA × Aa) PROCESS SKILLS Calculating Probabilities PROCEDURE 1. Using the
Premium Genetics Allele Gene
the dominant phenotype and one for the recessive phenotype. These two alleles comprise the gene pair. One member of the gene pair segregates into a gamete‚ thus each gamete only carries one member of the gene pair. Gametes unite at random and irrespective of the other gene pairs involved.(Carlson) The purpose of this lab is to teach students how traits of an organism can be predicted with a dihybrid cross using the recessive and dominant traits. Using a dihybrid cross given the phenotype and genotype
Premium Allele Genetics Gregor Mendel
characteristics are primarily expressed in the observable characteristics‚ or phenotype ‚ of men. This is due to the fact that men only have one X chromosome. Subsequently‚ genes on that chromosome not coding for gender are usually expressed in the male phenotype even if they are recessive since there are no corresponding genes on the Y chromosome in most cases. In women‚ a recessive allele on one X chromosome is often masked in their phenotype by a dominant normal allele on the other. This explains why women
Premium Chromosome X chromosome Genetics
Cell Division and the Cell Cycle 1) Define the following terms: Meiosis The production of daughter cells that have one half the number of chromosomes as the parent cell. It enables organisms to reproduce sexually. Mitosis The production of two daughter cells that are identical to the parent cell. Parent cell=haploid‚ daughter cell=haploid. Parent cell=diploid‚ daughter cell=diploid. Chromosome A structure of nucleic acids and protein found in the nucleus of most living cells‚ which carry genetic
Premium DNA Gene Genetics
Fruit Fly Lab Introduction The major topic of this experiment was to examine two different crosses between Drosophila fruit flies and to determine how many flies of each phenotype were produced. Phenotype refers to an individual’s appearance‚ where as genotype refers to an individual’s genes. The basic law of genetics that was examined in this lab was formulated by a man often times called the "father of genetics‚" Gregor Mendel. He determined that individuals have two alternate forms
Premium Allele Gregor Mendel Zygosity
I. Codominance in Humans A. Codominance is the phenotypes of both homozygotes are produced in the heterozygote. 1. Ex: sickle-cell disease II. Sickle-cell disease A. Homozygous for sickle-cell allele. B. Oxygen-carrying protein hemoglobin differs by one amino acid from normal hemoglobin. C. Defective hemoglobin forms crystal-like structures that change the shape of the red blood cells. D. Normal red bloods cells are disc-shaped‚ but abnormal red blood cells are sickle-shaped or half- moon. E
Premium Blood type Chromosome Red blood cell
Cell Cycle Describe how major events of cell division that enable the genome of one cell to be passed on to two daughter cells. List the phases of cell cycle and describe the sequence of events that occurs during each phase. There are two main stages of the cell cycle‚ with multiple subdivisions within each. Interphase is the first stage‚ and it’s composed of G1 (contents of the cell are duplicated sans the chromosomes)‚ S (chromosomal duplication)‚ and G2 (checkpoints) phase. After interphase‚
Premium Meiosis Chromosome Mitosis
of the two bases found in the DNA. Cytosine and thymine are pyrimidines. These are similar aromatic neterocyclic organic compounds. 2. How does an organism’s genotype determine its phenotype? I genotype is the genes present in your body. It is the organism’s full hereditary information. The phenotype is the composite organisms observable characteristics are traits. The genotypes are transcribed into mRNA (messenger RNA)‚ wearing these molecules that can be generic information from DNA
Free DNA RNA Gene
Data Table 2: Seedling data Seedling Color green yellow Total Number of Seedlings Percentage of Total Questions A. What are the predicted ratios of the phenotypes in the plants? B. What was the total number of seeds that germinated? C. What are the actual ratios of the phenotypes displayed in the tobacco plants? D. Explain why it may be important to collect data from a larger population. E. If all yellow seedlings were removed from the population
Premium Punnett square Green Allele