5. The family tree below shows the trait of having attached earlobes. Having attached earlobes is recessive, and having detached earlobes is dominant. People with attached earlobes are shaded in. a) Describe the sex and characteristics of the person labeled A. (1 point)

b) Describe the genotype of the person labeled B. (1 point)

c) Describe the genotype of the person labeled C. (1 point)

d) Could the person labeled D have a recessive allele? Explain. (1 point)

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos