Why would the chromosomes carrying the black allele (+) and the tan allele (tn) be considered homologous chromosomes?

The

homologous chromosomes

separate during meiosis I.

This time, the MI results

in two cells, each containing

both genes (1 tan, 1 wild-type); therefore, the genes for spore color have not yet segregated.

Explanation:

Two

homologous chromosomes line up at metaphase I of

meiosis. The two chromatids of one chromosome each

carry the gene for tan spore color (tn) and the two

chromatids of the other chromosome carry the gene

for wild-type spore color (+). The first meiotic

division (MI) results in two cells each containing just

one type of spore color gene (either tan or wild-type).

Therefore, segregation of these genes has occurred

at the first meiotic division (MI). The second meiotic division (MII) results in four cells, each with the

haploid number of chromosomes (lN).

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