1. flatworms are the first organism we have discussed with an anterior posterior orientation how does this affect their movements compared to the movement of more primitive organisms 2. What are the disadvantages of a flatworm’s digestive system having only one opening 3. the complete digestive tract of nematodes and […]

In a population of chicken, three color morphs defined by two alleles occur: dark brown with genotype BB, light brown with genotype Bb, and white with genotype bb. A breeder takes only the light brown chickens for a new breeding group and then let the chickens select their partners. If […]

Discoveries in DNA, cell biology, evolution, biotechnology have been among the major achievements in biology over the past 200 years with accelerated discoveries and insights over the last 50 years. Consider the progress we have made in these areas of human knowledge. Present at least three of the discoveries you […]

Suppose that in Drosophila melanogaster an XXY female with white eyes (due to the w^1 allele on both copies of an attached X chromosome) is mated with a male that has a yellow body (due to the y allele on the X chromosome). Which of the following best describes the […]