Question 1
A scientist is studying traits in corn. The picture shows the traits she is studying.
The scientists does a dihybrid cross of two corn plants. One corn plant is homozygous for yellow kernels and heterozygous for smooth kernels. The other corn plant is heterozygous for purple kernels and homozygous for smooth kernels. Which best describes the possible offspring of this cross?
a
There is a 50% chance of having purple, smooth kernels and a 50% chance of having yellow, smooth kernels.
b
There is a 50% chance of having purple, wrinkled kernels and a 50% chance of having yellow, shrunken kernels.
c
There is a 100% chance of having purple, smooth kernels.
d
There is a 100% chance of having yellow, shrunken kernels.
Question 2
By what method is the majority of carbon moved from the lithosphere (upper part of Earth's crust) to the atmosphere?
a
Weathering
b
Deposition
c
The burning of fossil fuels
d
Respiration
Question 3
Invasive species can pose threats to the ecosystem by altering the food web.
True
False
Question 4
How do invasive species spread?
Select all correct responses
a
Climate change expanding territory
b
Intentionally by humans
c
In ballast water from internationally traveling ships
d
Accidentally by humans
Question 5
What is the process by which bacteria in the soil convert nitrogen gas from the atmosphere into ammonia?
a
Denitrification
b
Ammonification
c
Nitrification
d
Nitrogen fixation
Answer 1: a) There is a 50% chance of having purple, smooth kernels and a 50% chance of having yellow, smooth kernels.
Answer 2: c) The burning of fossil fuels.
Answer 3: True.
Answer 4: b) Intentionally by humans and d) Accidentally by humans.
Answer 5: d) Nitrogen fixation.