CRCT chapter 9 Flashcards
In a classroom, 7 students have attached earlobes and 21 have detached earlobes. What fraction of students in the classroom have attached earlobes?
1/4
Jacob wrote instructions for an investigation of physical traits of students in his class. Which step should be FIRST?
Decide which traits to observe.
The order of the nitrogen bases in a DNA molecule determines an organism’s
Genes
Use table to answer questions 4:
Parents: Offspring:
Black Black Yellow
Yellow Black Green
A certain type of plant can be black, yellow or green. Black is dominant over yellow and green. Yellow is dominant over green. The table above shows the colors of two plants and four of their offspring. Which must be true?
Both of the parents must have a gene for green color.
Which is the BEST source for a picture and description of a DNA molecule?
Encyclopedia
Which is a learned behavior of the cat in the picture above? (cat sleeping on pillow in the sun).
Sleeping on a pillow in the sunlight.
David wants to investigate crossing two colors of flowers in his yard. Which type of investigation would be most useful?
Perform an experiment.
Which instrument do scientists use to observe DNA?
Microscope
Scientists from many countries study DNA, Which is the BEST reason the scientists should share details of their work?
So all scientists can learn from each other’s results.
The diagram above shoes how DNA…..
Makes copies of itself.
A change in DNA during replication is
A mutation
DNA was discovered in the 1800’s. It’s structure was determine in the 1950’s. This shows that old scientific knowledge,
May still be true today.
Students in a class compared traits of several small animals. Afterwards, they should
Wash their hands.
Abby observes a frog. Which statement is NOT an observation?
It will live at least 15 years.
A friend tells you that a certain type of flower is sometimes blue. Which is the best way to check this fact..
Search the internet.
