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Rhonda and Reuben just had a baby boy. If they could look at their baby's sex chromosomes, they would see
Epigenesis
Mechanism that turns genes on or off and determines functions of body cells.
Monozygotic Twins
Identical twins formed from a single fertilized egg that splits into two, sharing virtually all their DNA.
Environmental Factors
External elements such as climate, pollution, and social conditions that can affect an individual's health, development, and survival.
Zygote
One-celled organism resulting from fertilization.
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