Meiosis and dihybrid cross. Using blue and red pens/pencils to distinguish betwe
ID: 32363 • Letter: M
Question
Meiosis and dihybrid cross.
Using blue and red pens/pencils to distinguish between maternal (red) and paternal (blue) chromosomes, draw two homologous pairs of chromosomes showing four genes each. Each homologous pair should have at least one homozygous dominant gene, one heterozygous gene, and one homozygous recessive gene. Choose a descriptive name for each of the genes and alleles (e.g., eye color, blue vs brown) and label your diagram accordingly (your two homologous chromosome pairs should have entirely different genes). Indicate which allele is dominant and which isrecessive in each case (these can be hypothetical examples). Give different names to the two pairs of homologous chromosomes.
Now, make your two homologous pairs of chromosomes replicate and go through the process of meiosis I and II, including at least one event ofcrossing over per homologous pair. Show the results after Meiosis II of one complete set of possible gametes, with your chromosomes and the genes and alleles labeled as at the start of the process.
Now, allow any two of the gametes produced in part 2 by Meiosis II (indicate which) to mate with each other. Show the genotype and phenotype of the resultant offspring.
Using two of the genes that are heterozygous, one from each of the two different chromosomes from part 1, do a dihybrid cross. Show your Punnett square and the phenotype and genotype ratios for your F1 and F2.
Explanation / Answer
Meiosis and dihybrid cross. Using blue and red pens/pencils to distinguish betwe