Look at the diagrams modeling some of the body systems. Which pair of diagrams must be included in a model explaining why a hand pulls back suddenly from a hot flame?

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

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explanation:

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

hope this : )