Lab #2 Rebop Genetics Date

Lab #2 Rebop Genetics Date

Include a title page that has the title of the lab (in the center of the page) and your name, class and date at the bottom of the page.

Introduction:

- Follow the format provided on the website.

- Include at least 3 references done according to APA format and the guides found on the website.

- Explain the importance of genetic diversity to the survival of a species and properly use the following terms.

o Homozygous/Heterozygous

o Dominant/Recessive

o Chromosomes

o Genotype/Phenotype

o Incomplete/Co-Dominance

The key after this intro is to understand the terms.

This is a paragraph or paragraphs, not a list of definitions.

Use your own words. Plagiarism will result in a grade of 0 for the whole lab. This is like a research paper. Do not refer to the lab.

Purpose:

Will parents with the same traits always create offspring with the same traits?

Hypothesis:

Procedure/Observations:

REEBOP GENETICS

BODY SEGMENTS: Marshmallows

3 body segments = BB or Bb 2 body segments = bb

TAIL: Red Pipe cleaner

Curly tail = TT or Tt Straight tail = tt

EYES: Yellow Pipe Cleaner

2 eyes = EE or Ee One eye = ee

ANTENNAE: Blue Pipe Cleaners

2 Round antennae = AA 2 round and 2 flowered = Aa 2 Flowered antennae = aa

HOVER WINGS: Feathers

2 hoverwings = HH or Hh No hoverwings = hh

LEGS: Red, Yellow and Orange Pipe Cleaners

Red legs = L L Orange legs = L l YELLOW legs = l l

The GENOTYPE for your Rebop parents are both:

Bb Tt Ll Aa Hh Ee

This parent is ______for all of its alleles.

Homozygous heterozygous

What is its PHENOTYPE?

______

Draw and color a picture of what your parent Reebop looks like:

CHROMOSOMES:

Body Segments / B / B / b / b
Tail / T / T / t / t
Eyes / E / E / e / e
Antenna / A / A / a / a
Hoverwings / H / H / h / h
Legs / L / L / l / l

WRITE DOWN the GENOTYPE for your baby. ______

Create the Baby using the parts at the front of the class.

Use the code to DRAW AND COLOR A PICTURE OF WHAT THIS BABY WILL LOOK LIKE below:

Does this baby have the same GENOTYPE as its parents? YES NO

Does this baby have the same PHENOTYPE as its parents? YES NO

If a trait shows INCOMPLETE DOMINANCE which genotype must an organism have to show the intermediate blended phenotype?

A. PURE DOMINANT

B. PURE RECESSIVE

C. HETEROZYGOUS

D. HOMOZYGOUS RECESSIVE

Which trait in REEBOPS appears to blend and show INCOMPLETE DOMINANCE? ______

* * * * * * * * * * * * * * *

When neither of two alleles is dominant over the other, they don’t blend but BOTH APPEAR TOGETHER AT THE SAME TIME (like A and B blood type alleles). The gene is said to be CODOMINANT.

Which trait in REEBOPS appears to be CODOMINANT? ______

Why do you think so? ______

A Reebop with the genotype T t is ______for tail genes.

Homozygous heterozygous

A Reebop with the genotype L L is ______for leg genes.

Homozygous heterozygous

A Reebop with the genotype e e is ______for eye genes.

Pure hybrid

A Reebop with the genotype A a is ______for antenna genes.

Pure hybrid

What has to be true about the Reebop parents that show a DOMINANT allele for a trait, but have a baby that shows the RECESSIVE trait?

A. both parents are HOMOZYGOUS for the trait

B. both parents are HETEROZYGOUS for the trait

C. both parents are PURE for the trait

D. IMPOSSIBLE; Dominant looking parents can’t have a recessive looking offspring

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MAKE SOME REEBOP CROSSES Complete the Punnett Squares below.:

Curly tails (T) is dominant over straight tails (t)

Cross a HOMOZYGOUS CURLY TAILED MOM with a STRAIGHT TAILED DAD

GENOTYPE of offspring = ______

PHENOTYPE of offspring = ______

Could these parents ever have a straight tailed baby? YES NO

Explain why or why not? ______

This cross is a ______cross.

MONOHYBRID DIHYBRID

* * * * * * * * * * * * * * *

MAKE A CROSS BETWEEN

Cross a PURE STRAIGHT TAILED MOM with a HYBRID CURLY TAILED DAD

What is the probability the offspring will?

Have Curly tails: _____ out of 4 OR _____%

Have Straight tails: ______out of 4 OR _____%

Be hybrids: _____ out of 4 OR _____%

Be homozygous: _____ out of 4 OR _____%

MAKE A CROSS BETWEEN TWO REEBOPS THAT ARE HETEROZYGOUS FOR EYE GENES.

PROBABILITY GENOTYPE PHENOTYPE

____ out of 4 OR ______% will be ______

What is the probability that the offspring from this cross will be able to see? ______%

You are given a Rebop WITH EYES that can see. You would like to start a Rebop ranch and breed this Rebop to populate your ranch, however having blind Rebops is an added expense because they can’t find food on their own and you will need to hire more Rebop wranglers to watch them.

What could you do to find out whether this Rebop is EE or Ee? Breeding will be involved. We want to be 100% certain of the Genotype.

______

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