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LS7B Week 2 Lab Worksheet
Part 1. Modeling Meiosis
Draw the chromosomes as they would appear in each cell shown in the diagram below. Include Gene A and Gene D in
your drawings and be sure to designate which genes/alleles are present in each cell. Double check that the alignment
for the chromosomes is accurate during metaphase I and metaphase II, assume no crossing over.
Gene Durian
Yellow chromosomes,
alleles labeled “D” and “d”.
Gene Apple
Red chromosomes,
alleles labeled “A” and “a”
1. Explain Mendel’s principles of segregation and independent assortment.
According to Mendel's segregation principles, each gamete receives one allele from the mother and one
allele from the father. When genes assort independently of one another, this is referred to as independent
assortment.
2. Assuming no crossing over, does segregation of alleles occur in meiosis I or II? Explain your reasoning.
Because alleles segregate separately, allele seg...