1. Genetics Exam School: Name: Class: Date: Part 1: Fill in the blank
Directions: Use the words below to fill in the blanks. Use each word once.
DNA Gene(s) Allele Phenotype Genotype Dominant
Recessive Trait(s) Sperm Eggs Chromosome (s) Cell
Asexual Sexual Mitosis Meiosis Growth and repair
Each cell in the human body has 46 _____________________ containing genetic information.
Chromosomes are made of a molecule called _____________________________________.
3/4. A single ________________________ codes for a single ____________________________.
5/6. The genetic make-up of an organism is its _______________________________, but how it looks is called its ____________________________________________________________.
7. One version of a gene is called a(n) ______________________________________________.
8/ A _______________________________ gene usually masks a ______________________ gene.
The genetic information needed to create a new human being is located in each ____________________________.
In _____________________________ reproduction, all the genes come from a single parent.
In ____________________________ reproduction, typically half of the genes come from each parent.
13/14. In ___________________________________, identical cells are made through cell division. This accounts for ________________ of the body.
15/16/17. In ___________________________________, cells with ½ the hereditary information are created. This accounts for the creation male _________________and female ____________.

2. Directions: Read each question and then circle the correct answer.
Part 2: Multiple Choice
Directions: Read each question and then circle the correct answer.
18. Animals reproduce:
Only sexually
Only asexually
Some reproduce sexually and others asexually
Neither sexually nor asexually
19. Examples of asexual reproduction include all of the following except:
Budding
Fertilization
Division of a cell into two cells
Separation of part of an organism
20. In humans, each sperm and egg have:
23 chromosomes
46 chromosomes
23 pairs of chromosomes
46 pairs of chromosomes
21. Fertilization and development occur:
Internally
Externally
Internally for some organisms, externally for others
22. After fertilization, the egg:
Keeps dividing, with each new cell having identical genetic information
Keeps dividing, with each new cell have different genetic
Keeps dividing, with each new cell have ½ of the same genetic information
23. In humans, the fertilized egg turns into:
Sperm
Organs and tissues
Sex cells
Chromosomes
24. Body changes that occur during puberty are evidence that:
The body stays the same throughout its life cycle
The body only changes when it becomes sexually mature
Different parts and functions of the body change through their life cycle
25. All of the following impact the variation of species except:
Selective breeding
Changes in environmental conditions
Genetic engineering
fertilization
26. Organisms with similar needs:
Ignore one another
Compete for resources
Eat each other
Change their needs to reduce competition
When a species isn’t able to adapt to an environmental change, it:
Becomes endangered
Goes extinct
Changes the environment back

3. Directions: Read each question and respond in complete sentences
Part 3: Short Answer
Directions: Read each question and respond in complete sentences
28. Why are most fossils found in sedimentary rock?
Look at the two different-colored moths to the right.
How does the difference in the color affect the moths’
ability to survive on trees with dark bark?
b. What might happen to the populations of the moths
if all of the dark trees went extinct and
trees with white bark grew in their place?
What are the advantages of sexual reproduction over asexual reproduction?
How might mutation contribute the variation of species?
32. What is metamorphosis? Name an organism that undergoes metamorphosis.
33. The pedigree below shows the inheritance of the alleles fur color in rats. White means homozygous WW for white. Half black/half white has a heterozygous genotype, but will look white. Black means homozygous ww for black. What is the probability that the male offspring marked “?” will be black? % ?