23 May WHAT COMBINATION(S) OF CHROMOSOMES ARE POSSIBLE IN DAUGHTER CELLS FOLLOWING MITOSIS?
(6 points) A diploid cell contains three pairs of homologous chromosomes
designated C1 and C2, M1 and M2, and S1 and S2. No crossing over occurs.
a. What combination(s) of chromosomes are possible in daughter cells following
mitosis?
In mitosis, two genetically identical daughter cells are produced. Therefore, the
only possible combination of chromosomes is C1/C2/M1/M2/S1/S2 since all
genetic material is inherited.
b. What combination(s) of chromosomes are possible in haploid cells following
both divisions of meiosis? (Hint: remember independent assortment)
C1/M1/S1, C1/M1/S2, C2/M1/S1, C1/M2/S1, C1/M2/S2, C2/M1/S1, C2/M2/S1
or C2/M2/S2.
2. (15 points) A recessive mutant allele, black, causes a very dark body in
Drosophila when homozygous. The normal wild-type color is gray.
a. A black female is crossed to a heterozygous gray male. What are the parental
genotypes?
b. What F1 phenotypic and genotypic ratios are produced from this cross? (Show
your Punnett Square)
3. (9 points) R codes for red flower color and r codes for white flower color.
a. What color would Rr be if R has complete dominance?
b. What color would Rr be if R and r are codominant?
c. What color would Rr be if R has incomplete dominance?
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