Problem Set #5 (15 pts)
Due on March 3/4
Handout #5: Meiosis/Monohybrid cross
Imagine a diploid cell with 4 different chromosomes, A, B, C and D.
There are 2
different types of homologs for each chromosome, A and a, B and b, C and c, D and d.
a. (1 pt) If the diploid cell undergoes meiosis, how many possible genotypes could
there be after meiosis II (considering independent segregation only, not
(3 pts) List the genotypes of all these cells from part a :
, abcd, ABCd
, abcD, ABcD, abCd, AbCD, aBcd, aBCd, AbcD, aBcD,
AbCd, aBCD, Abcd, abCD, ABcd
(1 pt) If the A,B, C, and D homologs came from Mom, and a, b, c, and d came
from Dad, is it possible that a gamete created during meiosis could contain DNA
that originated from only one parent?
What is the probability of this occurrence?
1 in 8, or 12.5%
(1 pts) If the original diploid cell had two copies of the same chromosome A
(instead of having two different forms, A and a), how many different genotypes
could there be after meiosis I?