A)Twins Carlos and Miguel received bulldog puppies from the same litter for their birthday. Their parents thought they would be learning responsibility by caring for the dogs. Both boys fed and played with their dogs every afternoon. Both dogs slept by their beds each night. When baseball season started, Carlos had practice five days a week. Although he still took good care of his dog, he was not able to run and play with the dog as much as he had before baseball season. When the dogs went to the vet for a check-up, the vet told the boys that Miguel's dog was in great shape but Carlos' dog had grown a bit too heavy.
The weight difference in the twin's dogs was caused by(1 point)
Responses
an obesity gene.
an obesity gene.
a genetic mutation.
a genetic mutation.
an inherited condition.
an inherited condition.
an environmental factor.
Correct answer: an environmental factor.
Examine the data for goldfish size in different aquariums grown with varying numbers of other goldfish. Which statement is supported by the data?
Number of goldfish Average mass of each goldfish (grams)
1 350
5 300
20 200
50 100
(1 point)
Responses
Lack of competition with other fish is an environmental factor and increases how large goldfish can grow.
Lack of competition with other fish is an environmental factor and increases how large goldfish can grow.
Lack of competition with other fish changes the genetics of the goldfish and increases how large goldfish can grow.
Lack of competition with other fish changes the genetics of the goldfish and increases how large goldfish can grow.
An increase in the number of fish in the aquarium increases the size of the average goldfish.
An increase in the number of fish in the aquarium increases the size of the average goldfish.
A decrease in the number of fish in the aquarium decreases the size of the average goldfish.
A decrease in the number of fish in the aquarium decreases the size of the average goldfish.
Correct answer: Lack of competition with other fish is an environmental factor and increases how large goldfish can grow.
Mutations within a DNA sequence are—
(1 point)
Responses
natural processes that always affect the phenotype.
natural processes that always affect the phenotype.
unnatural processes that always affect the phenotype.
unnatural processes that always affect the phenotype.
natural processes that are harmful to genetic diversity.
natural processes that are harmful to genetic diversity.
natural processes that produce genetic diversity.