Explore BrainMass

Explore BrainMass


    Genetics -- map units

    EDIT to the problem below: I just realized that the various numbers of offspring add up to 9900, not 10,000, which is the supposed total. So for problem #2, I randomly added 100 to my recombinant numbers and got the answer, 30.1, which turned out to be correct. But the same thing did not work for problem #1. Adding 100 to the

    Double Cross-overs

    Hi. Can you help me with the following genetics problem, please: "Consider a pair of homologous chromosomes heterozygous for three genes (e.g., ABC/abc) during prophase I of meiosis. Let the sister chromatids of one homolog be numbered 1 and 2 (ABC); and the sister chromatids of the other homolog be numbered 3 and 4 (abc).

    Family Pedigree and Cystic Fibrosis

    Your sister has cystic fibrosis and you are contemplating having children of your own. Your mate recalls having a cousin with the disease. What is the risk that one or more of your children will have cystic fibrosis? If you can draw a pedigree of your family, assuming you have only one sister and your mate has only one sister.

    Punnett Square for Mendelian Genetics

    "a" is a dominant mutant allele of the A gene, and "b" is the recessive mutant allele of the B gene. To see the mutant phenotype, one requires either an "a" mutant phenotype or a "b" mutant phenotype (both mutations are not necessary). What would the F2 segregation ratio be (wild type to mutant) of the cross of an aabb mutant

    F1 and F2 generations: aa bb (mutant) x AA BB

    You cross an aa bb mutant plant with an AA BB wild type. What would the F2 segregation ratio be (wild type to mutant) if: a.) both mutations, a and b, were recessive? b.) both mutations were dominant? c.) one mutation was dominant and one recessive? (assume both mutations are required for the mutant phenotype) (assume t

    The Hardy-Weinberg law states two things:

    Background The Hardy-Weinberg law states two things: 1. If no outside forces are acting on the population, then the allele frequency will remain constant from one generation to the next. 2. If no outside forces are acting on the population, then the genotype frequencies will be p^2, 2pq, and q^2. The converses of these sta

    Understanding the Hardy-Weinberg equation is achieved.

    Which of the following statements is true? The Hardy-Weinberg equation provides a way to: Predict the response to a solution for a quantitative tract Determine the degree of drift affecting a population Calculate test credibility Predict genotype frequencies of given alleles Predict episodes of proverbial equilib

    Mutation Characteristics of the Gene that Codes for CAK

    Of the genes that code for CAK, wee1, and cdc25, which would you expect, when mutated, to stop a cell from continuing to divide? Which would you expect, when mutated, to cause the cell to proliferate in an uncontrolled manner?

    Factors Involved When Genetically Modifying A Mouse

    Suppose you are given the task of genetically modifying a mouse so that its skin cells secrete a bitter tasting protein that will protect it from predation. What factors would you have to consider in order to achieve this goal? You only need to consider protein targeting, do not be concerned with how you would get the gene int

    Probability genes

    Assume that a trait is determined by a single pair of genes where one allele is dominant and the other is recessive. In a population, 30% of the females are pure dominant, 60% are hybrid, and 10% are pure recessive. If a pure recessive male mates with a random female and their first offspring has the dominant trait, what is th

    Understanding BRCA genes, related to human breast cancer.

    Using the NCBI website resources find information related to BRCA genes, related to human breast cancers. Use "locus link" at http://www.ncbi.nlm.nih.gov/ (Tutorials are available if you get stuck) 1) find the chromosomal position of the BRCA-1 gene 2) what is another gene located next to BRCA-1 at this chromosome 3

    The Different Phases of Meiosis

    If a child more strongly resembles one parent's physical traits than the other parent's, the explantion could be due to chromosome movements during? A. anaphase II B. metaphase II C. prophase II D. anaphase I E. telophase I This study is discussed.

    Breeding Dihybrid Crosses

    In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s). If two dihybrids (Bb Ss) were crossed, which would be produced? A. black and spotted pure-breeding forms B. black and solid pure-breeding forms C. red and solid pure-breeding forms D. red and spotted pu

    Methods to study meiosis.

    What are some of the methods that scientists have used to study the components, processes, and outcomes of cell division?

    Genetics in Auxotrophic Mutation Strains

    1 Two new hair dyes A and B were tested in the Ames test. Both were tested with and without liver homogenate. Two auxotrophic strains of bacteria were used, one in which the auxotrophy was caused by a nonsense mutation (mutant 1) and the other by a frameshift mutation (mutant 2). After treatment the cells were plated on minimal

    Yeast Cells and Adenine-Requiring Auxotrophs

    4. In yeast, wild type colonies are white. Adenine-requiring auxotrophs (ad) are red when grown on medium containing limiting amounts of adenine. This is due to the accumulation of a red precursor in adenine biosynthesis. If cells from an ad strain are plated on minimal medium most cells don't produce colonies but two rare ty


    (a) Give the genotypes of the two parental goats, showing gene arrangement and gene order. (b) Give the % recombination between each pair of genes. (c) Draw a map showing the positions of all genes and distances between genes, where appropriate (d) Give the formula and calculate the coefficient of coincidence (e) Calcula

    Determining haplotypes is achieved.

    An autosomal dominant disease (Huntington disease) is being transmitted in the pedigree below. A two-allele marker (designated 1 and 2) has been typed for each family member. What are the mother's haplotypes i.e. which alleles are inherited together? What is the recombination frequency for the marker and the disease locus? What

    Drawing a linear map representing the order

    Five single rII deletion mutants of phage T4 were spot-tested in all pairwise combinations to test for their ability to give r+ recombinants. The results are given in Table (a). Five different point mutations were then tested in the same way for their ability to recombine with the five deletions. These results are given in Table