Download HeredityWebquest

Name _______________________________________Date ________________________
Heredity Web Quest
DNA from the Beginning – Mendelian Genetics
Go to http://www.dnaftb.org/dnaftb/1/concept/index.html
Children resemble their parents
Read the text and answer the following questions
1. How have useful traits been accumulated in plants and animals over the centuries?
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2. Was there a scientific way to predict the outcome of a cross between two parents? _____
3. Who determined that individual traits are determined by discrete “factors’? In what year?
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4. These “factors” are now known as ______________________.
5. Summarize what Mendel did?_________________________________________________
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Click on Animation at the bottom of the page. Move through the animation and answer the following
questions.
1. Why did Mendel work with pea plants? ________________________________________
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The next question deals with how pea plants self-fertilize
4. A) In the flower the male sex part is the ________________.
B) What does it drop inside the immature flower? ________
C) Name the female sex part? _____________
D) What are the sex cells that develop there? ________
E) What fertilizes the eggs? _________
F) Why do you think this is called self-fertilization? ______
The next question deals with how pea plants cross-fertilize
5. Summarize how cross-fertilization is accomplished?
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Why is it different from self-fertilization?
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Self-fertilization Cross-fertilization
On the right menu bar click on number 2 “Genes come in pairs”. Then at the bottom click on
Animation.
Click through the animation and answer the following questions
1. What is a phenotype? _________________________
2. What are the seven pairs of traits Mendel worked with in pea plants?
a. ____________ b. ______________ c. _______________ d. ________________
e. ______________ f _____________ g. ______________
3. Explain what Mendel reasoned from the existence of yellow and green seed colors
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4. What is an allele? ______________________________________________________________
5. What is a genotype? ____________________________________________________________
6. If a pea plant has the two alleles YY. What is its phenotype? ____________________________
What is its genotype? ___________________________________________________________
On the right menu bar click on number 3 “Genes don’t blend”. Then at the bottom click on
Animation.
Click through the animation.
2. What observations did Mendel make and what problem did he have to solve?
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On the right menu bar click on number 4 “Genes don’t blend”. Then at the bottom click on
Animation.
Click through the entire animation. Answer the following using the type of diagram that is found in
the animation
1. Diagram the cross & offspring between pure-bred green with pure-bred yellow.
Use this website to answer the questions below:
http://www.cccoe.net/genetics/heredity.html
Heredity and Genetics
1) What is Heredity?
2) What is the study of heredity?
3) What are traits?
4) What are genes made of? What structures are genes strung together in?
5) What do genes have the instructions for making? What smaller units are these things made of?
6) How a trait develops depends on what two things?
http://www.cccoe.net/genetics/mendel.html Use this link for the questions below.
Mendel's Experiments
7) Who formed the basic laws of heredity?
8) Why do we call him “The Father of Genetics?”
9) What is special about “purebred” plants?
10) Mendel decided that traits are handed down through what in the sperm and egg?
11) How many “factors” for every trait must a plant (or animal, or human) have?
12) How many factors does each egg or sperm get?
13) What do we call Mendel’s “factors”?
14) What are dominant alleles?
15) What are recessive alleles?
16) What is the scientific term for “purebred”?
17) What term do we use for “hybrid” alleles?
http://www.cccoe.net/genetics/dominant1.html Use this website for the questions below.
Dominant, Recessive Genes
18) What does homozygous mean?
19) What does heterozygous mean?
20) How do we write a dominant allele?
21) How do we write a recessive allele?
(Try the questions on the website!)
22) What is phenotype?
23) What is genotype?
24) What are two genotypes that could produce a dominant phenotype?
25) What is the ONLY genotype that can produce a recessive phenotype?
(Try the questions on the website!)
Punnett Squares http://www.cccoe.net/genetics/punnett.html
26) What are Punnett squares used for?
27) Predict the results from the Punnett square on the website: TT x tt
28) Predict the results from this Punnett square on the website: Tt x Tt
29) Look at the information about widow’s peak from the website. Complete the Punnett square to show the
possible outcomes of a cross of a heterozygous father with a widow's peak with a homozygous mother with a
widow’s peak.
30) What fraction of offspring would have a widow's peak?
31) What fraction of offspring would not have a widow's peak?
Got to the Morgan Genetic’s Tutorial. Write down your answers to the quizzes at the end of each section. Do
all six sections.
http://morgan.rutgers.edu/MorganWebFrames/htmldocs/contents.php
32) Understanding genetics is almost impossible if you don't know the terminology or how certain symbols are
used. In the second part of the assignment you need to learn the following vocabulary and the meaning of
several symbols. Do this by visiting the following sites and writing the definition (IN YOUR OWN WORDS)
for the 15 vocabulary words
http://www.genome.gov/glossary.cfm
http://www.sonic.net/~nbs/projects/anthro201/
1. alleles
2. heterozygous
3. homozygous
4. trait
5. chromosome
6. phenotype
7. genotype
8. recessive
9. dominant
10. P1
11. F1
12. F2
13. uppercase letter, ie. - G
14. lowercase letter, ie. - g
15. gamete