Genetics Quiz Study Guide

Definitions:

 

  • genetics
  • heredity
  • gene
  • allele                           
  • homozygous
  • heterozygous
  • multiple alleles
  • dominant
  • recessive
  • co-dominant
  • sex-linked
  • pedigree
  • genotype
  • phenotype

Questions:     

  1. Know what the various symbols in genetics represent (capital letters, lowercase letters).
  2. What are the genotypes of blood?
  3. What are the phenotypes of blood? 
  4. Which alleles for blood are co-dominant, recessive and dominant?
  5. How many alleles are there for blood type?
  6. If a gene has multiple alleles, why can a person still only inherit 2 alleles.
  7. Are males or females are more likely to be red-green colorblind? Why?
  8. Can males be carriers of red-green colorblindness? Why or why not?
  9. Is red-green colorblindness dominant or recessive?  How do you write each allele?
  10. Explain how a chicken from a black-feathered mother and a white feathered father can be black with white splotches.
  11. If you are purebred for a trait, you are ____________zygous.
  12. If you are hybred for a trait, you are ____________zygous.

 

Punnett squares:

  • Guinea pig fur is either curly (H) or straight (h)
    • Which allele is dominant?  How can you tell?
    •  Which allele is recessive?  How can you tell?
  • Practice the following Punnett squares (tell phenotype and genotype and percentages of offspring)
    • a homozygous straight fur female and a homozygous curly fur male
    • a heterozygous curly fur female and a heterozygous curly fur male
    • a homozygous straight fur female and a heterozygous curly fur male
    • a homozygous curly fur female and a heterozygous curly fur male

 

Labeling and Diagrams:

  1. Complete the following Punnett square for baldness (a sex-linked recessive trait)

B: dominant allele (normal hair)

b recessive allele (bald)

 

  • Is the female parent bald? How can you tell?

 

  • Is the female parent a carrier of baldness? How can you tell?

 

  • Is the male parent bald? How can you tell?

 

  • Draw a pedigree of this family. Assume that there are four children, each one represented by each box of the Punnett square (Be sure to indicate whether or not the each person is affected, not affected or is a carrier.
  • Assume the homozygous daughter marries a bald male and has a daughter. Add the daughter to your pedigree (HINT: create a Punnett square first to help).
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