Scientist rely on <em>Biology </em>concepts when researching crop production and medicine.
C........................................................................................................
<span>D. grass they eat and water they drink</span>
Answer:
When homologous chromosomes form pairs during prophase I of meiosis I, crossing-over can occur. Crossing-over is the exchange of genetic material between homologous chromosomes. It results in new combinations of genes on each chromosome. It is obviously another source of genetic variation in offspring.
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