B81
Genetics Lab.doc


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B81 Genetics Lab

Name _________________________________________ Date _____________

Traits Symbol Paper Clip Color
Black B Blue
Red b red
Polled P Green
Horned p yellow
Tall T Pink
Dwarf t white
Strait hair S Purple
Curly hair s Silver

* The bold traits are dominant

1. Take one paper clip out of each container.

2. Link your paper clips together to form a chain, 4 paperclips long. The chain represents a strand of DNA. The paper clips must be linked in the order below.
Record the Phenotype of your animal.

                                        Phenotype

Color

Horned/Polled

Size

Hair

3. The DNA strand is going to undergo mitosis and replicate itself. To do this go back and select 4 more paper clips from each container and form another chain exactly like your first chain. Record the Genotype of your animal.

                                        Genotype

Color

Horned/Polled

Size

Hair

4. Each chain represents a strand of DNA. The two chains laid parallel to each other represent a chromosome. Each paper clip represents a gene. Each location along the chains represents an allele (two genes controlling the same trait). Now your chromosome is going to undergo meiosis and form a gamete (a sex cell) that contains half the genetic information of the parent. Now exchange your gamete (one DNA strand) with a classmate.

5. Line up your classmates chain beside your chain to form a new chromosome. Record your new genotype and phenotype.

                                        Genotype                     Phenotype

Color

Horned/Polled

Size

Hair


6. Exchange the DNA strand of your choice with a different classmate and record the results of the cross again.
Genotype Phenotype

Color

Horned/Polled

Size

Hair

7. Exchange the DNA strand of your choice one last time with another classmate whom you have not yet had an exchange with, and record the results of the cross again.

                                        Genotype                    Phenotype

Color

Horned/Polled

Size

Hair