Rebop Genetics

Introduction:

- Follow the format provided on the website.

-Include at least 2 references done according to the guide found on the website.

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

  • Homozygous/Heterozygous
  • Dominant/Recessive
  • Chromosomes
  • Genotype/Phenotype
  • 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.

Purpose:

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

Hypothesis:

Materials:

Procedure/Observations:

REEBOP GENETICS

BODY SEGMENTS:

3 body segments = BB or Bb2 body segments = bb

TAIL:

Curly tail = TT or TtStraight tail = tt

EYES:

2 eyes = EE or EeNo eyes = ee

ANTENNAE:

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

HOVER WINGS:

2 hoverwings = HH or HhNo hoverwings = hh

LEGS:

BLUE legs = L LGREEN legs = L lYELLOW legs = l l

The GENOTYPE for your Reebop 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

CUT your Chromosomes apart and then LAY your parent chromosomes FACE DOWN on your desk.

  1. Separate each trait into a separate pile --- legs, antenna, wings, body, eyes, and tail.
  2. Scramble the Chromosomes (letters) in each pile.
  3. Choose one chromosome (letter) from each pile to make a gamete.
  4. You may WORK WITH A PARTNER to combine your GAMETE (letters) and Their GAMETE to each form a BABY Reebop.

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?

  1. PURE DOMINANT
  2. PURE RECESSIVE
  3. HETEROZYGOUS
  4. 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?

  1. both parents are HOMOZYGOUS for the trait
  2. both parents are HETEROZYGOUS for the trait
  3. both parents are PURE for the trait
  4. IMPOSSIBLE; Dominant looking parents can’t have a recessive looking offspring

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

MAKE SOME REEBOP CROSSES:

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 ______

____ out of 4 OR ______% will be ______

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

What could you do to find out whether this Reebop is EE or Ee? ______

What kind of Reebop would you breed this one with to find out its genotype?

______

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

1