Genetics and DNA Review
1.
Due Date:
Name: _____________________
The three molecules that make up the structure of DNA are ___________________________,
_________________________________ and ________________________________________.
2. _______________________________________________took the first picture or x-ray of DNA.
3. _______________________ & ______________________created the first 3-D model of DNA.
4. The four nitrogenous bases are ____________________, ________________________,
___________________________________ and ____________________.
5. Both the words ______________________ and _______________________________ mean having
two different alleles for a trait.
6. The structure of DNA is called________________________ ____________________________.
7. A ____________________ is a section of DNA that has the instructions for a trait.
8. __________________________ are made up of many genes.
9. Another word for a characteristic is _________________________________________.
10. Variations in a single trait are called __________________________________________.
11. ____________________ is the term that means the actual alleles and organism has for a trait.
12. The ___________________________ _____________________ is always expresses or shown on the
organism when present.
13. _______________________ _______________________ is the considered the father of Genetics.
14. The passing of traits from parent to offspring is _________________________________________.
15. The _______________________ _________________________ is always masked or hidden by the
dominant allele. Only expressed when an organism is _____________________________ for the trait.
16. Mendel used ________________________ pea plants for his experiments.
17. The F1 generation in Mendel’s experiment were all _____________________________.
18. ______________ ___________________ insures that all new cells will have an exact copy of the
organism’s genetic information.
19. The process that produces gametes is called _________________________________________.
20. Of the allele combinations below circle all those that are heterozygous
AA
Bb
CC
cc
Dd
Ee
Ff
ff
FF
Zz
21. A ______________________________________ is used to determine the outcome of a genetic cross.
22. Both _________________________ and _________________________ mean an organism has two of
the same alleles for a trait.
23. Circle all the examples of homozygous alleles.
Bb
bb
Cc
DD
Ff
ff
cc
EE
24. During meiosis __________________ daughter cells are created with _________________ the DNA
as the parent cell.
25. In humans there are ____________ chromosomes making ___________ pairs.
26. The last pair of chromosomes are called the __________ chromosomes because they determine the
gender in humans.
27. The study of heredity is called ____________________________________________.
28. _______________________________ are made up DNA and become visible during cell division.
29. Of the traits listed below circle all those that are inheritable
Ability to speak a language
Hair color
being an Olympic swimmer
Height
Number of arms
Size of nose
Loss of arm due to accident
Gender
Intelligence
30. In following scenarios write the genotypes for each of the parents described. Use the letter F in all
examples. Orange fur is recessive to Black fur in hamsters
A homozygous recessive mom is crossed with a heterozygous dad
______________ x ___________
A hybrid Dad is crossed with a homozygous dominant mom
______________ x ___________
A purebred Black mom in crossed with a heterozygous dad
_____________ x ___________
Two heterozygous parents are crossed
______________ x ___________
31. For the following scenarios write the phenotypes for each allele combination.
Spotted tails is dominant or plain tails
SS _________________________ Ss__________________________ ss_____________________
Long tails is recessive to short tails
Ll ___________________________ LL _________________________ ll____________________
32. Complete the Punnett square for the following crosses. Spotted fur is recessive to plain brown fur in
rats. Use the letter F for your genotypes.
a.
Cross a heterozygous mom with a homozygous recessive dad
What are the possible genotypes of the children?
What are the percent probability for each genotype?
b. Cross a homozygous dominant Dad with a homozygous recessive mom
What are the possible phenotypes?
What are the percent probability for each phenotype?