ASU BIO 182 Exam 2 BUNDLE (COMPLETE COURSE)NEWEST
ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+(2025)
Head in the Clouds
Giraffes are the tallest animals on land. An adult giraffe has a neck that exceeds 2 m in length. This neck
enables a giraffe to access food that other animals cannot reach and detect predators from a long
distance. Studies have shown that giraffes will browse trees at heights that other herbivores cannot
reach. The water and nutrients gained from leaves enhance a giraffe's fitness by increasing survival and
reproduction. However, a long neck comes with a cost: the heart must spend more energy to pump
blood to the brain. If a giraffe's neck were too long, the energy required to circulate blood would exceed
the energy gained from eating leaves.
1. In a population of giraffes, the average length of the neck is under directional selection. -
(answer)False
Over many generations, the average length of necks in a giraffe population will increase indefinitely. -
(answer)False
The relationship between a giraffe's neck length and its fitness would be better described by a quadratic
equation (y = ax^2 + bx + c) than a linear equation (y = ax + b). - (answer)True
Natural selection would reduce the variation in neck length in a population of giraffes. - (answer)True
In the absence of mutation, the heritability of neck length in a population of giraffes would remain the
same. - (answer)False
Puddle Ponds
During the summer, a small pond loses water to evaporation. Eventually, this pond becomes a series of
puddles separated from one another by at least several meters. Most animals disperse or die as the
, ASU BIO 182 Exam 2 BUNDLE (COMPLETE COURSE)NEWEST
ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+(2025)
pond dries, but some microbes still remain in the puddles. Each of these species used to live in the pond
as a much larger population, but are now subpopulations that reside in the puddles.
Some of the microscopic species with short generations are bacteria, paramecia, and rotifers. All of these
species reproduce asexually, except for one species of rotifer that reproduces sexually. The puddles
remain separated until the following spring, when abundant rain causes them to expand and form a
pond like the one from last year.
6. During the time that subpopulation lived in puddles, they would have been considered sympatric. -
(answer)False
While in separate puddles, genetic drift could cause the evolution of reproductive isolation in rotifers. -
(answer)True
When the pond reforms, the rotifers from each puddle could be considered different evolutionary
species. - (answer)True
When the pond reforms, the bacteria from each puddle would be considered different biological species.
- (answer)False
When the pond reforms, natural selection would favor prezygotic isolating mechanisms that reinforce
any postzygotic isolating mechanisms. - (answer)True
Fickle fleas
Daphnia magna is an aquatic species of crustaceans, commonly referred to as the water flea. These
animals have 10 pairs of chromosomes, all of which are autosomal. Most water fleas are females that
reproduce asexually. During asexual reproduction, a single female produces as many as a hundred
offspring at a time. Each offspring is genetically identical to the mother (except for a few mutations). As
winter approaches, however, some offspring develop into males and the population reproduces sexually.
ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+(2025)
Head in the Clouds
Giraffes are the tallest animals on land. An adult giraffe has a neck that exceeds 2 m in length. This neck
enables a giraffe to access food that other animals cannot reach and detect predators from a long
distance. Studies have shown that giraffes will browse trees at heights that other herbivores cannot
reach. The water and nutrients gained from leaves enhance a giraffe's fitness by increasing survival and
reproduction. However, a long neck comes with a cost: the heart must spend more energy to pump
blood to the brain. If a giraffe's neck were too long, the energy required to circulate blood would exceed
the energy gained from eating leaves.
1. In a population of giraffes, the average length of the neck is under directional selection. -
(answer)False
Over many generations, the average length of necks in a giraffe population will increase indefinitely. -
(answer)False
The relationship between a giraffe's neck length and its fitness would be better described by a quadratic
equation (y = ax^2 + bx + c) than a linear equation (y = ax + b). - (answer)True
Natural selection would reduce the variation in neck length in a population of giraffes. - (answer)True
In the absence of mutation, the heritability of neck length in a population of giraffes would remain the
same. - (answer)False
Puddle Ponds
During the summer, a small pond loses water to evaporation. Eventually, this pond becomes a series of
puddles separated from one another by at least several meters. Most animals disperse or die as the
, ASU BIO 182 Exam 2 BUNDLE (COMPLETE COURSE)NEWEST
ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+(2025)
pond dries, but some microbes still remain in the puddles. Each of these species used to live in the pond
as a much larger population, but are now subpopulations that reside in the puddles.
Some of the microscopic species with short generations are bacteria, paramecia, and rotifers. All of these
species reproduce asexually, except for one species of rotifer that reproduces sexually. The puddles
remain separated until the following spring, when abundant rain causes them to expand and form a
pond like the one from last year.
6. During the time that subpopulation lived in puddles, they would have been considered sympatric. -
(answer)False
While in separate puddles, genetic drift could cause the evolution of reproductive isolation in rotifers. -
(answer)True
When the pond reforms, the rotifers from each puddle could be considered different evolutionary
species. - (answer)True
When the pond reforms, the bacteria from each puddle would be considered different biological species.
- (answer)False
When the pond reforms, natural selection would favor prezygotic isolating mechanisms that reinforce
any postzygotic isolating mechanisms. - (answer)True
Fickle fleas
Daphnia magna is an aquatic species of crustaceans, commonly referred to as the water flea. These
animals have 10 pairs of chromosomes, all of which are autosomal. Most water fleas are females that
reproduce asexually. During asexual reproduction, a single female produces as many as a hundred
offspring at a time. Each offspring is genetically identical to the mother (except for a few mutations). As
winter approaches, however, some offspring develop into males and the population reproduces sexually.
