administration student task rubric student work technical quality
 
Human Inheritance
Task with Student Directions
Contributed by: The State University of New York
The State Education Department, Albany, New York (NYSED)
1996 Administration

Task: In this task you will analyze genetic characteristics from a family tree.

Directions

Part I

Based your answers to the following questions on the pedigree chart below and on your knowledge of biology. The pedigree traces the expression of a particular trait, represented by the darkened symbol, through three (3) generations. These generations are labeled Patent Generation, F1, and F2 so that the correspond to the generations of pea plans that Gregor Mendel used to formulate his Laws of Heredity.



Answer sheet
Part 1 - Human Inheritance

  1. Is the trait represented by the darkened symbol dominant or recessive?

    ___________________________________________

  2. Using complete sentences describe how Mendel would have explained your answer to question #1?

    ____________________________________________________________________

    ____________________________________________________________________

    ____________________________________________________________________

    ____________________________________________________________________

    ____________________________________________________________________

  3. Describe all the possible genotypes of Bernie, his mother, his father, and his brother, Al.

    ____________________________________________________________________

    ____________________________________________________________________

    ____________________________________________________________________

  4. Using complete sentences explain how you determined your answer to question #3.

    ____________________________________________________________________

    ____________________________________________________________________

    ____________________________________________________________________


Part II

Directions:

Base your answers to the following questions on the pedigree chart below and on your knowledge of biology. The pedigree traces the expression of a particular trait, represented by the darkened symbols, through three (3) generations. Studies have shown that individuals with this trait are frequently male. The trait rarely appears in females and only if the father also has the trait.

  1. Is the gene for this trait dominant or recessive?

    ___________________________________

  2. Is the gene for this trait carried on the X or Y chromosome?

    ___________________________________

  3. Using complete sentences explain why the trait is more common in males than in females.

    ____________________________________________________________________

    ____________________________________________________________________

    ____________________________________________________________________

  4. Using coded symbols give the genotypes of the following family members?
    Be sure to include your symbol for representing the genotypes you describe.

    Symbols -

    Bruce - ________________________________

    Bruce's Father - ________________________________

    Bruce's Mother - ________________________________

    Mary - ________________________________

  5. If Doug marries a woman whose lacking the trait, but whose father has the trait, what is the probability that they will have a son with the trait? What is the probability of their daughters having the trait?

    ____________________________________________________________________

    ____________________________________________________________________

NYS Alternative Assessment in Science Project
NSF Grant #MDR-9154506
Copyright, April 1996
The State University of New York
The State Education Department
Albany, New York 12234

 


©1997-2005 SRI International. All rights reserved. Terms of Use