Draw out a pair of homologous chromosomes in the round, smooth parent showing the arrangement of E, e, F and f alleles
Added by Andres C.
Step 1
In this example, assume that allele E produces the round trait (with e being for wrinkled) and allele F produces the smooth trait (with f being for rough). Since the parent exhibits the dominant traits, its genotype is heterozygous for both genes (E/e and F/f). Show more…
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Shown below is a schematic of a nucleus of a cell with the genotype DdEeFf, where the D and E loci are on the large chromosome and the F locus is on the small chromosome. This cell was taken from an F1 organism that resulted from the cross of two true-breeding parents, such that one of the true-breeding parents had the genotype DDeeFF and the other had the genotype ddEEff. On a piece of paper, redraw this image for yourself and place the D, d, E, e, F, and f alleles on the drawing. Assume the nucleus you drew above enters meiosis. On a piece of paper, draw for yourself a new picture that represents the chromosomes as they could be when in metaphase of meiosis I. Include the D, d, E, e, F, and f alleles on the drawing and assume no recombination.
Adi S.
Genes D, E & F are all located on autosome #4. Dominant alleles are represented by capital letters and recessive alleles are represented by lower-case letters. 1000 random offspring of the cross DdEeFf X ddeeff were analyzed. The observed phenotypic distribution is indicated on the table below. Draw the two copies of chromosome 4 in the cells of the triply heterozygous parent. Be sure to depict the genes in their correct order on the chromosome and provide allele symbols to show which alleles are linked together. A chromosome can be easily drawn like this: ---------A---------b---------C--------- Calculate the map distance between locus D & locus F on chromosome 4.
An organism has 2n=4 chromosomes with the D/d alleles on the homologous 1 pair and E/e on the homologous 2 pair. A nondisjunction occurs during meiosis II that affects one of the chromosomes. Draw a cell in anaphase I, the resulting cells in anaphase II, and the resulting gametes. In your drawings, show the alleles on each chromosome. Assume crossing over does not occur.
Bryan V.
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