Learning from the Fossil Record
Grade 8 Science
Name: Liam McAlister
Date: 1/10/11
Pre-Post Focus Question Worksheet on Heredity
A. Pre-Evaluation: Answer the following question.
Why is their variation among siblings and between offspring and parents?
There is variation among siblings and between offspring because certain traits aren’t read by the
cells from the one side and one generation. There is a variation between offspring and parents
because certain genes that the parents show aren’t inherited by the offspring . When neither of
the parents have the trait and the offspring has it, the generation was skipped. If there are
variations among siblings then certain traits weren’t read that the other’s read from the parents.
When parents reproduce, one gene from each parent for each trait is inherited by the offspring.
Certain genes dominate over others, so if they are both inherited the stronger one shows up.
When a recessive gene and a dominant gene are inherited, sometimes a new gene is “created”;
incomplete dominance. Offspring vary amongst each other because they inherited different
genes. It has nothing to do with dominance and it is a random process.
Somewhat Confident
Red/strikethrough=incorrect/useless
Green=added
Yellow=correct
Learning from the Fossil Record
Grade 8 Science
Name: Liam McAlister
Date: 1/10/11
B. Post-Evaluation: Revise your pre-evaluation response using the rubric below.
Revisions indicate formation of new ideas
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Revisions indicate correction old ideas
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Revisions indicate what was already known
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C. Post-Evaluation: Use your revisions from (B) to answer this question in RASE format.
Restate clearly shows what question is asking
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Answer provides accurate and complete explanation
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Support utilizes appropriate and ample research,
discussions, and/or schema
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End provides closure to ideas
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Why is their variation among siblings and between offspring and parents?
Learning from the Fossil Record
Grade 8 Science
Name: Liam McAlister
Date: 1/10/11
There is a variation between offspring and parents because certain genes that the parents show
aren’t inherited by the offspring. When parents reproduce, one gene from each parent for each
trait is inherited by the offspring. Certain genes dominate over others, so if they are when the
two genes of the same trait are inherited, the stronger one shows up. When a recessive gene
and a dominant gene are inherited, sometimes a new gene is “created”; called incomplete
dominance. When the parents reproduce, the offspring can inherit genes that they don’t show.
It could turn out that one of the traits the parents show, the offspring doesn’t inherit. In
conclusion, there is variation between offspring and parents because the offspring inherit genes
the parents don’t show.
Offspring vary amongst each other because they inherited different genes. During reproduction,
the children randomly inherit one gene from each parent for each trait. Siblings can end up with
different genes from their parents. They end up with homozygous dominant, recessive, or
heterozygous genotypes. Sometimes they have co-dominant and incomplete dominance.
Overall, there is variation amongst siblings due to the genes they so happen to inherit from their
parents.