Lesson 1 — Theories and Terminology of Inheritance


Try This

Click anywhere on the Genetics Term Matching interactive activity below  to open it up in a new window.  Make sure the answer box you are dropping a term into is outlined before dropping it.  There are two pages to complete.


Self-Check

Complete the following set of questions to see how many of these genetics concepts you have begun to internalize!


    1. Separate the two chromosomes by meiosis.

    2. What type of cell is formed as a result of meiosis?
    3. What term is used to describe "T" and "t"?
    4. Which of Mendel's laws does the above example illustrate?

  2. Place the appropriate term in the space provided for each picture. Use the following words: genotype, phenotype, segregation.

    Blue eyes   bb  
     a. _______________ 
    		 b. ________________  c. __________________


  3. Indicate whether each of the following is a trait (controlled by an allele) or a characteristic (controlled by a gene):

    1. wrinkled seed
    2. curly hair
    3. pod colour
    4. plant height

  4. How many types of gametes do individuals with the following genotypes produce? (Hint: Each gamete contains only one from each letter pair.)

    1. AABBCC
    2. AaBbCc
    3. AaBbCC

  5. What are the gamete types produced by an individual with genotype WWTtPp?

  6. What evidence exists for Mendel's principle of dominance?

  7. Which term identifies or describes these genotypes?

    a. Rr / Pp   
    b. RR / PP

Self-Check Answers



    2. The cells created by meiosis are called gametes.
    3. The "T" and "t" are known as alleles with "T" being dominant and "t" being recessive.
    4. The Law of Segregation is illustrated.

  2. a. phenotype
    b. genotype 
    c. segregation

  3. Genes control characteristics such as the colour of hair. Alleles are forms of a gene that express traits of a characteristic such as brown hair colour.

    1. wrinkled seed - trait
    2. curly hair - trait
    3. pod colour - characteristic
    4. plant height - characteristic

  4. Gametes

    1. One (ABC)
    2. Eight


    3. Four


  5. WTP, WTp, WtP, Wtp - four unique gametes

  6. The reappearance of the recessive trait in the F2

  7. a. heterozygous
    b. homozygous / true breeding

Diploma Connection

Answer the following questions from a previous Biology 30 Diploma Examination.

  1. Alternate forms of the same gene are known as
    1. alleles
    2. gametes
    3. genotypes
    4. heterozygotes

  2. Mendel's principle of segregation states that alternate forms of a gene separate during
    1. fertilization
    2. seed dispersal
    3. cross-pollination
    4. gamete formation

  3. An organism is heterozygous for two pairs of genes. The number of combinations of alleles that can form from these two genes in the organism's gametes is
    1. 1
    2. 2
    3. 4
    4. 8

Use the following information about tobiano twin colts to answer the next question.

Descriptions and Symbols Used to Represent One Type of Coat Colour in Horses

1

2

3

4

DNA sequence for coat colour

TT, Tt

T Tobiano (white spotting pattern)
 

tt

t Not tobiano (no white spotting pattern)

 


Numerical Response

4.   Using the numbers above, match these descriptions and symbols with the term below to which they apply.

 

Description or Symbol Number:  _____ 
 _____ 
 _____  _____
 Term:
 gene 
 allele 
 phenotype
 genotype

                                                                    

Diploma Question Answers


  1. A
  1. D
  2. C
  1. 1342

Biology 30 © 2008  Alberta Education & its Collaborative Partners ~ Updated by ADLC 2019