Name:-_______________
Date:________________
Genetics Test Review
1. True or false: Males and females have completely different chromosomes.
2. Nucleotides, which make up DNA, are made up of three smaller particles. What are they?
3. A frog has a region on a chromosome that codes for leg size. This frog could either have 6cm legs or 12
cm legs. Using this example, what is the gene and what is the allele?
4. Using the same frog in #3, let’s say that having short legs is dominant. Draw a Punnett square that
would show the mating between an “Ss” genotype and a long-legged frog.
5. What are the possible genotypes and percentages of the Punnett square outcomes in question #4?
6. What is the percent chance in producing offspring with short legs?
7. What is it called when a blue bird and a red bird mate and produce purple offspring?
8. What is it called when a blue bird and a red bird mate and produce a red and blue dotted offspring?
9. If you get one chromosome #4 from mom and one chromosome #4 from dad, what are these
chromosomes called?
10. If a scientist puts a “hairless” gene into a rat to make it have no hair, what is this called?
11. At what point in the rat’s life would scientists have to insert the gene?
Circle one: Adult
2 years old
1 year old
just born
cell stage
12. In the following list, circle the traits that Ralph has that he did not inherit:
Blue eyes
Buffalo Bills fan
Type A blood
Brown hair
Chef
Round nose
13. What is a mutation?
14. How can mutations in DNA be disastrous to an organism?
15. What is the molecule that reads RNA and produces proteins?
16. Fill in the matching DNA strand: GATTACA
17. What are some benefits and risks of genetic engineering?
18. The trait for purple eyes in unicorns is more prevalent (which means there are more unicorns with purple
eyes). Is the trait dominant, recessive, or you can’t tell?
19. Having a tail is dominant in Woolly Mammoths. Show a cross between a pure dominant woolly
mammoth and a pure recessive woolly mammoth.
20. If woolly mammoths (from question 19) have 8 offspring, how many will not have tails?
21. What does phenotype mean?
22. Which scientist discovered dominant and recessive traits?
23. Which scientist discovered the structure of DNA by X-raying it?
24. Which scientists won the Nobel Prize for discovery of DNA?
25. How many chromosomes do we have?
26. What is the structure of the DNA molecule?
27. If you coil up and coil up and coil up DNA (along with protein) you get a _______________ .
Meanwhile, most of your DNA doesn’t get used, but the useful parts that code for traits are called
______________.
28. Where is DNA located in an organism? (be specific)
29. Explain why two blue- eyed parents cannot make a brown eyed child, but two brown eyed parents can
produce a blue-eyed child.
30. Tyler has brown eyes, but his brother has blue eyes. Meanwhile, his dad has brown eyes, and his mom
has blue eyes. Explain, using a Punnett square, how this can happen.