Meiosis Activity Worksheet

  1. and pair the following basic genetic concepts with their respective descriptions/definitions:

Match

______ 1. Gene                                                a. Two different alleles

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______ 2. Allele                                               b. Observable heritable feature that may vary among organisms.

______ 3. Phenotype                    c. Two identical alleles

______ 4. Genotype                      d. Describes the specific alleles present in the offspring.

______ 5. Homozygous                                e. Segments of DNA responsible for producing a particular trait.

______ 6. Heterozygous               f. Variants of a gene present for a particular character.

 

  1. From the figure presented here, determine the following:
    1. Which letter(s) show a phenotype?

 

 

 

  1. Which letter(s) show a genotype?

 

 

 

  1. In letter (c), are we looking at a homozygous recessive,
    a homozygous dominant, or a heterozygous individual?

 

 

 

  1. In letter (e), are we looking at a homozygous recessive,
    a homozygous dominant, or a heterozygous individual?

 

 

 

 

  1. A and a are dominant and recessive alleles, respectively, of the same gene. Which genotype(s) would result in an individual with the dominant trait?
  2. A) AA and aa
  3. B) AA and aa
  4. C) only AA
  5. D) AA and Aa
  6. E) only Aa

 

  1. For Labrador retrievers, black fur color (B) is dominant to yellow fur color (b). If a heterozygous black male mated with a homozygous yellow female, what would the puppies look like? Determine the phenotypic ratios.
  • Step 1: Determine the genotype of the female and male Labradors.

 

Heterozygous black male: _______________   Homozygous yellow female: _______________

  • Step 2: Write/Type the cross between the two Labradors.

 

X

 

 

  • Step 3: Do a Punnett Square to determine the probable genotypes for the offspring and to determine the phenotypic ratio.
 

 

 

 

 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

  • Step 4: Determine the Phenotype ratios of the progeny:

 

 

 

 

  1. There are many humans’ traits that are fairly simple and that follow the Mendelian pattern of inheritance. However, most of our traits are much more complex, involving many genes or interactions between genes. For example, hair color is determined by at least four genes, each one coding for the productions of melanin, a brown pigment. Because the effect of these genes is cumulative, hair color can range from blonde (little melanin) to very dark brown (much melanin).2

Human traits are of great interest to us and there are few traits that seem to exhibit Mendelian inheritance, such as the ones shown below (this can be found in your lab manual).

 

  1. Mid-digi
  2. M
  3. Mid-digital hair
  4. Tongue rolling
  5. Widow’s peak
  6. Earlobe attachment
  7. Hitchhiker’s thumb
  8. Relative finger length

 

 

With the information provided in your lab manual, Section 13-3 (pages 172-174), choose one out the six traits presented here and complete the following table.

Table  13-8: Summary of My Mendelian Traits
Trait My phenotype My possible genotypes Mom’s Dad’s My possible/Probable Genotype
Phenotype Possible Genotype Phenotype Possible Genotype
 

 

 

             

The space provided here is for you to fill out the table after selecting which trait you will follow to complete the table.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REFERENCES

  1. BIOL-101 Lab Manual: Lab Manual for Non-Majors Biology by Perry, Morton & Perry. 6th

BIOL-101 Textbook: BIOLOGY: Today & Tomorrow w/o Physiology by Starr et.al.

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