The Living World 6th Edition by George Johnson, Jonathan Losos,William Ober,Claire Garrison

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Figure 11.10 Using the four gametes shown from the F 1 generation, how many possible crosses are there Remember that a gamete type could cross with another of the same type (such as RY × RY ). Draw a Punnett square for each cross, and list the ratios of genotypes and phenotypes for the F 2 generation of that cross.