Create A Baby Lab



Create A Baby Lab

PURPOSE:. To demonstrate that gene, and traits, are passed on from generation to generation. The concepts of dominance, genotype, phenotype, and incomplete dominance will be illustrated.

MATERIALS:

Colored pencils/Crayons Two pennies

PROCEDURE:

1. Determine your genotypes as closely as you can. Sometimes, if you have a dominant phenotype (brown hair), it may be hard to determine whether you are Homozygous or Heterozygous for the characteristic, based on your parent’s and/or grandparent’s phenotypes. If so, for the purposes of this lab, flip a coin to see it you’re Homozygous -BB (HEADS) or Heterozygous-Bb (TAILS.)

2. Record your genotypes and phenotypes in Table 1.

3. Choose a mate! For the purposes of this lab, everyone in the class is a hermaphrodite (an organism having both male and female organisms.) Because of this, it will be possible for you to “mate” with any other classmate, regardless of their phenotypic sexual characteristics. Remember, this lab is FUN and we want everyone to be able to participate, regardless of whether we have a perfect match between male and females in the room!

4. Make a baby (hypothetically, that is!) Each partner should flip a coin to see whether they are going to donate a Dominent (HEADS) or Recessive (TAILS) allele for each characteristic. If you are Homozygous Dominant or Homozygous recessive for a characteristic, you need not flip a coin (you only have ONE possible allele you can donate.) Record your baby’s genotypes and phenotypes in Table 1.

5. The sex of the baby is determined by the father. For this characteristic only the “father,” flips the penny. If heads comes up, the baby is a boy, If tails is flipped, the baby is a girl. Now, you have the responsibility of naming the child.

6. Using the phenotype for each characteristic you recorded in Table 1, DRAW the head of your baby with colored pencils or crayons on a sheet of 8 2 by 11 paper. It is important that you remember to draw BABY, not a child or adult. You can NAME your child and include any pertinent birth statistics on the sheet with your drawing, including your baby’s parentage.

DOMINANT/RECESSIVE TRAITS:

Face Shape: Chin Shape:

Mouth Size: Nose Size:

WIDOW’S PEAK CO-DOMINANT TRAITS: HAIR TEXTURE

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EYE SIZE EYE DISTANCE

COLOR OF EYEBROWS:

Darker than Hair Same as hair Lighter than Hair

(DD) (Dd) (dd)

EYEBROW TEXTURE: EYE LASHES:

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EAR SHAPE: EAR LOBES:

CLEFT IN CHIN: DIMPLES IN CHEEK:

LIP THICKNESS: FRECKLES:

EYE SHAPE:

MULTIPLE ALLELE TRAITS:

For this lab, we will assume that only two gene pairs control for hair and eye color. For the first gene pair, flip the pennies and record the results (AA,Aa,aa). For the second gene pair, again flip your pennies and record your results (BB,Bb,bb). For Hair Color, if the red allele runs in your family, you may have to use a coin for (RR,Rr, rr) along with the B or A alleles. Now combine the two gene pairs.

Gene Pairs Hair Color Gene Pairs Hair Color Gene Pairs Hair Color

AABB Black AARR Dark Auburn BBRR Dark Auburn

AABb Dark Brown AARr Dark Auburn BBRr Dark Auburn

AaBb Light Brown AaRr Auburn BbRr Auburn

AAbb Brown AArr Auburn BBrr Auburn

Aabb Blond Aarr Chestnut Bbrr Chestnut

aaBB Dark Blond aaRR Bright Red bbRR Bright Red

aaBb Blond aaRr Light red bbRr Light red

aabb Pale Blond aarr Strawberry Blond bbrr Strawberry Blond

Gene Pairs Eye Color Gene Pairs Eye Color

AABB Deep Brown Aabb Gray-Blue

AABb Deep Brown aaBB Green

AAbb Golden Brown aaBb Dark Blue

AABB Hazel aabb Pale Blue

AaBb Brown

Name Date

Period Assignment #

RESULTS:

TABLE 1.

| | | | |

| |MOTHER |FATHER |BABY |

|TRAIT | | | |

| | | | | | | |

| |genotype |phenotype |genotype |phenotype |genotype |phenotype |

| | | | | | | |

|Chin Shape | | | | | | |

| | | | | | | |

|Mouth Size | | | | | | |

| | | | | | | |

|Nose Size | | | | | | |

| | | | | | | |

|Widow’s Peak | | | | | | |

| | | | | | | |

|Hair Texture | | | | | | |

| | | | | | | |

|Eye Size | | | | | | |

| | | | | | | |

|Eye Distance | | | | | | |

| | | | | | | |

|Eye Brow Color | | | | | | |

| | | | | | | |

|Eye Brow Texture | | | | | | |

| | | | | | | |

|Eye Lashes | | | | | | |

| | | | | | | |

|Ear Shape | | | | | | |

| | | | | | | |

|Ear Lobes | | | | | | |

| | | | | | | |

|Cleft in Chin | | | | | | |

| | | | | | | |

|Dimples in Cheek | | | | | | |

| | | | | | | |

|Lip Thickness | | | | | | |

| | | | | | | |

|Freckles | | | | | | |

| | | | | | | |

|Eye Shape | | | | | | |

| | | | | | | |

|Hair Color | | | | | | |

| | | | | | | |

|Eye Color | | | | | | |

1. How many genes for a Dominant/Recessive trait does it take to code for the trait?

2. How many genes do the parents give for the Dominant/Recessive trait?

3. Define Genotype:

4. Define Phenotype:

5. What percentage of the genotype does each parent give?

6. What happens to the traits for a co-dominant trait situation?

7. How many genes combine for the skin color trait?

8. Why was this trait not included in this lab?

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