Name______________________________ Date____________ Class_________ My partner _____________
Patterns of Inheritance
1. Answer the following questions using the website: http://www.dnaftb.org/1/
a. Click “Concept 1-Children Resemble Their Parents” on the right side of the screen.
i. Who was responsible for discovering that traits are inherited from parents?
b. Click “animation” at the top of the screen (Note: Use the arrow at the bottom right corner of the
animation to move through all slides).
i. What are three reasons why Mendel studied pea plants?
ii. What three steps did Mendel follow to cross-pollinate pea
plants?
c. Click “Concept 2-Genes Come in Pairs” on the right side of the screen.
i. Mendel studied specific ____________ of pea plants. He found that each trait in pea
plants had 2 ____________ ______________.
ii. Because purebred yellow peas only produce yellow seeds and purebred green peas
produce only green seeds, Mendel assumed purebred plants have _____ _________ of
the same gene.
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d. Click “animation” at the top of the screen.
i. What is the phenotype of a pea plant?
ii. List the seven traits Mendel studied in pea plants and the two
phenotypes for each trait.
Trait
Phenotype 1
Phenotype 2
Example: Flower position
Top
Side
iii. The trait of seed color has two forms, green or yellow. These different forms are called
_________________.
iv. A purebred green pea plant has the two alleles : YY
Yy
yy
(circle one)
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e. Click “Concept 3-Genes Don’t Blend” on the right side of the screen.
i. T or F : When purebred green pea plants are crossed with purebred yellow plants, the
offspring are an intermediate green-yellow color.
f. Click “animation” at the top of the screen.
i. How many of the traits Mendel studied were blended in the offspring when two
purebreds were crossed?______________
ii. How many of the traits Mendel studied were present in the hybrid offspring?
_____________
g. Click “Concept 4-Some Genes are Dominant” on the right side of the screen.
i. Why did the Mendel only see yellow seeds when a purebred yellow pea plant was crossed
with a purebred green pea plant?
ii. Results of the pea color experiment showed that pea color is controlled by ______
_________.
iii. Each form of a gene is called a(n) _________________.
iv. A purebred green pea plant has two ____________ that are the same and they are
________.
v. A purebred yellow pea plant has two ___________that are the same and they are
________.
vi. When both alleles are the same, the plant is called _______________.
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vii. When a plant has two different alleles, the plant is called __________________.
viii. What two alleles can a pea plant have if it has yellow seeds? _____ or ______
ix. When two heterozygous plants are crossed the _______________ _____________
reappears.
h. Click “Concept 5-Genetic Inheritance Rules” on the right side of the screen.
i. How many forms of the gene are passed from each sperm and egg?_____
i.
Click “animation” at the top of the screen.
i. The ____________ ____________ is used to keep track of the alleles in the gametes (sex
cells).
ii. Complete the following cross:
Y
y
Y
y
iii. What are the three genotypes in the offspring from the cross above? _____ _____
_____
iv. Yellow peas can have the genotype ______ or _______, but they have the same
_______________ which is the color _________.
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2. Watch the video at the following link and answer the questions below:
http://www.neok12.com/php/watch.php?v=zX57774078797d7564675a0a&t=Genetics
a. Click Part 1, then answer these questions:
i. Genes are a small part of a long molecule called _________.
ii. When someone says “You have your father’s hair”, what do they mean?
iii. Genes tell a cell: How to ________________ and what
______________________.
iv. Long molecules of DNA are organized into pieces called ________________.
v. Humans usually have _____ chromosomes or _______ pairs.
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