Mammalian milk contains antibodies that are produced by the mother's immune system and passed to offspring during feeding. Mammalian milk also contains a sugar (lactose) and may contain proteins (protein A, protein B, and casein), as indicated in the table.
MILK COMPONENTS IN DIFFERENT MAMMALS
Character | Cat | Cow | Horse | Human | Pig |
Lactose | + | + | + | + | + |
Protein A | + | + | + | + | + |
Protein B | − | + | + | − | + |
Casein | − | + | + | − | + |
+ indicates the presence of the character, and − indicates the absence of the character |
Using the data in the table, construct a cladogram on the template provided to indicate the most likely evolutionary relationships among the different mammals. Indicate on the cladogram where each of the characters most likely arose in the evolutionary process, and justify the placement of the characters on the cladogram.
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