AnswersSY2025-26 - 2002070 MJ Comprehensive Science 2 Sem 1 CRCumulative Exam

Cumulative Exam — Cumulative exam Answers

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Which best describes independent assortment?

A
In metaphase 1, chromosomes from the mother and father line up on opposite sides of the cell.
B
In metaphase 1, chromosomes from the mother and father line up randomly along the middle of the cell.
C
Portions of each chromosome switch sections in the mother’s and father’s chromosomes.
D
Portions of each chromosome break off and reattach to the original chromosome.
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Which would be the outcome in a fertilized egg if the process of meiosis did not occur?

A
twice as many chromosomes as the parents
B
half as many chromosomes as the parents
C
same number of chromosomes as the parents
D
triple the number of chromosomes as the parents
43

What describes the likelihood that a given event will occur ?

A
Probability
B
Percentage
C
Genotype
D
Phenotype
44

In a mouse population, some mice have thicker fur than others, but there are more mice with thinner fur. The climate in which these mice live has slowly gotten colder.

A
The adaptation of thinner fur will be selected over thicker fur, and the population will remain unchanged.
B
The adaptation of thicker fur will be selected over thinner fur, and the population will remain unchanged.
C
The adaptation of thinner fur will be selected over thicker fur, and the population will evolve.
D
The adaptation of thicker fur will be selected over thinner fur, and the population will evolve.
45

Which situation is an example of a human-induced environmental change affecting a population?

A
Blue jays no longer live in a forest because the trees in the forest were cut down.
B
A volcanic eruption killed grasses that were growing within a few miles of the volcano.
C
Floods from a storm forced many white-tailed deer to move to a new habitat.
D
A fisher caught a few different species of fish that live in an ocean habitat.
46

Which chemicals are major contributors to ozone layer destruction? Select two answer choices.phosphorusnitrogenbrominechlorinecarbon dioxidemethane

A
phosphorus
B
nitrogen
C
bromine
D
chlorine
E
carbon dioxide
F
methane
47

Kayla is learning about ecology and made a study chart.Which headings best complete the chart?

Question illustration
A
X: AbioticY: Biotic
B
X: BioticY: Abiotic
C
X: NicheY: Habitat
D
X: HabitatY: Niche
48

Which greenhouse gas is produced by commercial refrigeration and air conditioning systems?

A
carbon dioxide
B
fluorinated gas
C
nitrous oxide
D
methane
49

The diagram shows two different types of fossils from the same kind of ancient organism.

Question illustration
A
X: moldY: cast
B
X: castY: mold
C
X: traceY: imprint
D
X: imprintY: trace
50

Which characteristics describe the genetic code of humans? Select three options.can help in development of effective medicationscan only help understand human geneticscan help explain genetic diseasescomposed of about 19,000 genescomposed of 23 chromosomes

A
can help in development of effective medications
B
can only help understand human genetics
C
can help explain genetic diseases
D
composed of about 19,000 genes
E
composed of 23 chromosomes

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