Biology- Feb 19-23

Topic: Genetics

Classwork:
Gene Linkage and Human Genome Project
Pedigree Problem

Homework:
Reading ?’s 7.4– Due Wed, Feb 21st
Review (see below)- Due Fri, Feb 23rd

Project:
Pedigree Project (see guidelines below)- Due Thurs, Feb 22nd

Test:
Genetics Test- Fri, Feb 23rd

Genetics Unit
Performance Task #2
Family Pedigree

Goal: Create a pedigree of at least three generations, including at least seven family members, demonstrating the inheritance of a simple inheritance human genetic trait to an interested family.

Audience:  Your target audience is family who wishes to know about their inheritance patterns. (This could be your own family or that of a friend or acquaintance.)

Possible Traits to Study: Cleft chin (dimple in the chin); Facial dimples; Attachment of the ear lobe; Facial freckles; Hitchhiker’s thumb; Widow’s Peak

Project Requirements:

  • Interview family members to identify what phenotype each member has.
  • Using the phenotypes over the three generations to identify genotypes. Use Punnett squares and written explanation for your evidence for the identification of genotypes.
  • Using this information, draw a pedigree, using the correct symbols, to show the inheritance of the selected trait in this family.

Rubric:

Identification of Genotypes
Major Errors Minor Error(s) Well-Done
Phenotypes match to the identified genotypes There are more than 3 individuals in the pedigree whose phenotypes do not match the correct genotype One or two individuals in the pedigree whose phenotypes do not match the correct genotype All phenotypes match genotypes accurately
Punnett squares Punnett square inaccurately display the inheritance patterns by which the traits were passed from one generation to the next Punnett squares demonstrate the inheritance patterns by which the traits were passed from one generation to the next, with one or two errors. All Punnett square accurately demonstrate the inheritance patterns by which the traits were passed from one generation to the next
Written explanation Written explanation does not provide details about the identification of genotypes OR the explanation reveals major errors in the identification of genotypes Written explanation gives a detailed, accurate description of the identification of the genotype of most individuals on the pedigree OR the explanations fails to fully detail the identification of accurate genotypes Written explanation gives a detailed, accurate description of the identification of the genotype of all individuals on the pedigree

 

Pedigree
Major Errors Minor Error(s) Well-Done
Inheritance Display The pedigree displays how one trait is passed through the three generations, but with errors in multiple generations. The pedigree displays how one trait is passed through the three generations, but with an error in one of the three generations. The pedigree accurately displays how one trait is passed through the three generations.
Symbols Symbols for males, females, displaying trait, carrier, and non-displaying are used, with three or more errors Symbols for males, females, displaying trait, carrier, and non-displaying are used, with one or two errors Correct symbols for males, females, displaying trait, carrier, and non-displaying are used

 

Genetics Review

Ch.6 & 7

  • State Mendel’s three laws of inheritance
  • Explain how Mendel performed his experiments. (mention P, F1 and F2 generations)
  • What were the results of each of Mendel’s experiments? (F1 and F2 generations)
  • Define pedigree, complete dominance, incomplete dominance, codominance, phenotype, genotype, dominant, recessive, testcross, X-linked, allele, heterozygous, and homozygous.
  • When dealing with a completely dominant trait, under what conditions can a recessive trait appear?
  • Why do males more often have a X-linked recessive phenotype than females?
  • Describe how the following human traits are inherited: blood type, hair texture, color blindness, brown or blue eye color, and hemophilia
  • Draw a simple pedigree, showing the following a male with a trait and a female without the trait have a carrier female child and a child who does not have the trait. Label the following: symbol for male, symbol for female, indicates that it has the trait, indicates that it is without the trait, indicates marriage, indicates offspring, and indicates siblings.
  • Describe what are linked genes and how this impacts their inheritance

**Review your Punnett square and pedigree practice worksheets.  You should know how to complete Punnett squares for complete dominance, incomplete dominance, codominance, multiple alleles, X-linked, and two factor crosses.  You should be able to derive the parents’ genotypes based on their offspring.  You should also be able to interpret a pedigree.

 

 

 

 

 

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