STAAR EOC Review

What is the probability of two heterozygous parents producing an offspring with a homozygous recessive genotype?

• 50%

• 25%

• 75%

• 10%

Answer explanation

The probability of two heterozygous parents producing an offspring with a homozygous recessive genotype is 25% according to the Punnett square. This is because there is a 25% chance of the offspring inheriting two recessive alleles.

Which result is most likely to occur to the beetle population due to predation over time?

• The number of light-colored beetles in the population will increase.

• There will be more dark-colored beetles than light-colored beetles.

• The number of light-colored beetles will decrease.

• The dark-colored beetles will move to a different type of tree.

Answer explanation

The number of light-colored beetles in the population will increase as they are less likely to be preyed upon due to their color, leading to a higher survival rate.

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-4

In mitosis, the two resulting cells are

• different from the starting cell and identical to each other.

• different from the starting cell and different from each other.

• identical to the starting cell and different from each other.

• identical to the starting cell and identical to each other.

What are the three main parts of a nucleotide?

• carbon, hydrogen, and oxygen

• phosphate, sugar, and nitrogen base

• phosphate, sulfate, and nitrate

• adenine, thymine, and uracil

What is the order of succession shown in this figure?

• A, B, C, D

• B, A, D, C

• C, D, A, B

• D, A, B, C

Tags

NGSS.MS-ESS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

The graph shows the number of taxa of reptiles whose fossilized tracks have been found.

Which statement is best supported by these data?

• Competition for food and shelter among reptile species was very low during the Triassic period.

• A great extinction occurred during the Jurassic period.

• Environmental conditions for speciation were most favorable for reptiles during the Permian period.

• Reptiles adapted to a terrestrial environment during the Cretaceous period.

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NGSS.MS-LS4-1

The process by which the genetic code of DNA is copied into a strand of RNA is called

• translation

• transcription

• transformation

• replication

What phase is this cell in?

• Cytokinesis

• Mitosis

• Prophase

• Metaphase

What is the primary function of the mitochondria in eukaryotic cells?

• Energy production

• Protein synthesis

• Photosynthesis

• Cell division

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-5

Which of the following elements is most abundant in the Earth's crust?

• Oxygen

• Silicon

• Aluminum

• Iron