- Slides: 31
2 ND QUARTER CRT STUDY GUIDES
1. What effect do animals have on the environment? • They release carbon dioxide into the atmosphere.
2. A puppy chews on objects other than food. This type of behavior is • An inherited innate behavior
3. Pheromones are released by an organism that • Affect the behavior of other animals of the same species.
4. A change in ocean current causes the climate on an island to become drier. As a result, the grasses that cover the island change from dark green to light brown. Over time, how might a species of green toads that hide in the grasses and are subjected to predation respond to these changes? • Their coloration will change to brown.
5. When effective insecticide is used on a population of insects, most of the insects are killed. However, a few may survive due to genes that make the resistant to the insecticide. What is the BEST explanation of why this occurs? • Insects that survived sprayings passed their resistant genes to their offspring.
6. Snowshoe hares experience a change in fur color from brown in the summer to white in the winter. Which statement best describes how the appearance of a particular snowshoe hare may change after it lives in a warm climate year-round, for many generations? • It would have brown fur all year long.
7. Less than ten thousand years ago, environmental changes separated some individuals of a squirrel population to one side of the Grand Canyon. Today, these squirrels now show a white tail and black belly. Their ancestors exhibited gray tails and white bellies. This difference in fur coloring most likely • Is evidence of speciation due to geographical isolation.
8. What is the end result of meiosis? • Four genetically different cells are formed
9. How does the number of chromosomes in egg and sperm at the end of meiosis compare with that in body cells? • They have half the number of chromosomes
10. Which student correctly identified the number of chromosomes in each organism? Gypsies Moth Guinea Pig Diploid Haploid 1 40 20 25 50 2 10 40 50 40 3 20 40 25 50 4 20 40 40 50 Student 3
11. What statement describes the beginning and end products of meiosis? • One diploid cell becomes four haploid cells.
12. The sperm cells of a squirrel have 20 chromosomes. How many are found in a body cell of the same animal? • 40 Chromosomes
13. How would a gene be described? • As the coded instructions for a trait
14. What is the function of the cell part labeled X? It contains the genetic instructions to control cell processes.
15. Which student has identified correct functions of a chromosome? Student 3
16. How will an organism be affected if part of its chromosome is missing? • The organism will lack the necessary information to control cell processed.
17. If a scientist is trying to decide if a molecule is RNA or DNA, for what should he test? • Thymine
18. The order of bases along a gene determines the order in which • Amino acids are put together to form a protein.
19. What is the function of RNA? • Copy the coded message from the DNA and carry it into the cytoplasm.
20. What nucleic acids are present in both DNA and RNA? • Guanine and Adenine
21. A DNA molecule is being transcribed onto a RNA molecule. The next base to be transcribed on the DNA sequence is adenine. Which base will be the complement in the RNA molecule? • Uracil
22. Which strand must be DNA, and not RNA?
24. A science student was asked to construct models of DNA and RNA sections. Which section is correctly constructed and should be placed into a DNA strand?
25. When does a mutation occur? • When there is a change in the order of the bases in an organism’s DNA
26. A pea plant has alleles for green and yellow seed colors. According to Mendel’s law of segregation of characteristics, what must a gamete of the plant carry? • Only one allele
27. A pea plant has white flowers and yellow seeds. What does Mendel’s law of independent assortment say about these traits? • Inheritance of one trait does not affect the other.
28. In a cross of parents that are pure for contrasting traits, only one form of the trait will appear in the next generation. Offspring that are hybrid for a trait will have only the dominant trait in the phenotype. This is an example of which of Mendel’s laws? • Law of Dominance
29. In a plant, tall (D) is the dominant allele. Short (d) is the recessive allele. Which GENOTYPE would a short offspring have? • dd
30. Be able to interpret a pedigree chart MALES=SQUARES FEMALES=CIRCLE HAVE TRAIT=COLORED COMPLETELY IN CARRIER=HALF COLORED IN LINE CONNECTING TWO=MARRIED RCOMPLETE ROW=GENERATION