Name ________________________________________________ Date ________________ Period _________
Genetics Study Guide
Part A: Read pages 112-123 in your Sciencesaurus. Also study all labs, readings, and vocab list.
Part B: Fill in the table below with the definition of each vocabulary word in the first column, in the second
column use the word in a sentence. A good sentence should allow the reader to infer the meaning of the
word without knowing the definition Ex: Good Sentence – The chromosomes are located in the nucleus in
the center of the cell. Poor Sentence – The cell has a nucleus.
Word
Heredity
Chromosome
Gene
Allele
Characteristic
Trait
Asexual
Reproduction
Sexual
Reproduction
Offspring
Definition
Good Sentence
Word
Definition
Good Sentence
Clone
Dominant
Recessive
Homozygous
Heterozygous
Genotype
Phenotype
Part C: Big ideas.
1. Describe Marfan syndrome; be sure to discuss, what causes it, what the symptoms are, and what
lifestyle choices people affected by Marfan syndrome can make to reduce their symptoms.
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2. Who is Mendel? What were his contributions to the field of genetics and how did he test his ideas (be
specific and explain how he did his experiments and what he found out)?
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Part D: Complete the following questions about punnett squares.
1. Name the dominant trait and explain your reasoning.
a. Two short tailed mice were crossed. Some of the offspring have long tails.
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b. A chestnut horse is crossed with a black horse. All the foals are black.
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2. Identify the following genotypes as homozygous dominant, homozygous recessive or heterozygous.
Dd ______________________________________________________________________________
DD ______________________________________________________________________________
dd ______________________________________________________________________________
3. The allele for brown eyes (B) is dominant over the allele for blue eyes (b).
a. What are the genotype and phenotype for a homozygous dominant individual?
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b. What are the genotype and phenotype of a homozygous recessive individual?
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c. What are the genotype and phenotype of a heterozygous individual?
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4. Yellow seed color is dominant to green seed color. Complete the following cross: Yy & YY
Offspring Genotype:
Offspring Phenotype:
5. Green leaf color is dominant to white leaf color. Cross two heterozygous green plants.
Offspring Genotype:
Offspring Phenotype:
6. If an A parent is crossed with a B parent and half the offspring are A and the other half are AB, what
are the possible genotypes of the parents and the offspring?
Parents: ______________________
Offspring: ______________________
Part E: Use the pedigree below to answer the following questions. The shaded parts of the diagram are used
to identify family members who have brown eyes.
1. What is this type of diagram called? ______________________________________________________
2. What do the circles represent? __________________________________________________________
3. How many children did Mr. and Mrs. Lopez have? ___________________________________________
4. How many of the Lopez children were males? ______________________________________________
5. Was the oldest Lopez child a girl or boy? __________________________________________________
6. What color are Mrs. Lopez’s eyes? _______________________________________________________
7. How many children have blue eyes? ______________________________________________________
8. How many generations of the Lopez family are shown on the diagram? __________________________
9. What color eyes does the granddaughter of Mr. and Mrs. Lopez have? __________________________
10. What color eyes seems to be dominant and how can you tell? _________________________________
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