Next, morgan crossed the red-eyed f1 males with the red-eyed f1 females to produce an f2 generation. the punnett square below shows morgan’s cross of the f1 males with the f1 females.
drag the labels to their appropriate locations to complete the punnett square for morgan’s f1 x f1 cross.
drag pink labels onto the pink targets to indicate the alleles carried by the gametes (sperm and egg).
drag blue labels onto the blue targets to indicate the possible genotypes of the offspring.
labels can be used once, more than once, or not at all.

Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?