Is it possible for a recombination event to turn Muller's ratchet "forward" in the population of chromosomes below? The dots on the chromosomes indicate deleterious mutations. Indicate the crossing-over event by placing an X on the figure. 
Definitions:
Amino Acid
Organic compounds that serve as the building blocks of proteins, necessary for the structure, function, and regulation of the body's tissues and organs.
Glycogen
A complex carbohydrate stored in the liver and muscles, which can be broken down into glucose to provide energy.
Lactation
The production and secretion of milk by the mammary glands of postpartum females.
Oxytocin
A hormone and neurotransmitter involved in childbirth and lactation, also playing a significant role in behaviors like bonding and trust.
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