You have a diploid cell that is 2n = 4. One of the chromosomes (Chromosome 1) has genes G, H, and P on it and the other chromosome (Chromosome 2) has D, S and Q on it. The genotype of the organism is GgHhPpDdSsQq. Chromosome 1 has the genotype GhP and its homologue 1' is gHp. Chromosome 2 has the genotype DSq and its homologue chromosome 2’ is dsQ.
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An organism has a diploid chromosome number of 4 (2N=4) and is homozygous recessive for the G gene and heterozygous for the H gene, and heterozygous for the N gene (GGHhNn) genotype. The G gene is on a different chromosome from N and H, which are linked. A) Draw the cell in G1, showing the arrangement of the genes and alleles on the chromosomes. B) Draw the chromosomes with these two genes at metaphase of mitosis. C) Show anaphase I of meiosis. Show the result of crossing over between the N and H genes on one and only one of the appropriate chromosome pairs. D) What are all of the gametes possible from this one individual?
Adi S.
You will draw by hand a cell that clearly displays the following. Include labels as appropriate. Remember, someone looking at your final drawing should be able to readily identify all characters indicated below. • Diploid organism • n=2 (chromosome 1 and chromosome 2) • Chromosome 1 with gene A (heterozygote) • Chromosome 2 with gene B (heterozygote) • At prophase of mitosis
Bryan V.
Background: The vast majority of cells contain chromosomes. Each chromosome contains a long molecule of DNA. Each DNA molecule contains many genes. A gene is a segment of a DNA molecule that is a unit of information that is transcribed. Different versions of the same gene are called alleles. In genetics, we use a variable to refer to a full set of all types of chromosomes in an organism: n. A cell that contains one of each type of chromosome has a ploidy number of 1n. In humans, a 1n cell has 23 chromosomes. A cell that has two versions of each type of chromosome has a ploidy number of 2n (diploid). In humans, a 2n cell has 46 chromosomes. Most organisms are diploid, however, other ploidies exist, especially in plants. For example, seedless watermelon is triploid (3n), white potato is tetraploid (4n), and some types of wheat are hexaploid (6n). Complete the table below: In this activity, you will be working with an organism with a diploid chromosome (2n) number of four. * What is the haploid chromosome number (n)?
Nicole C.
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