Who Killed

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Who Killed
Lord Robert Lancaster?
Lord Robert Lancasters body with a long dagger
protruding from the chest- lay sprawled in his
library. A draft of Lord Roberts new will,
which would have disinherited his family and left
his vast fortune to charity, was still on his
desk. The will was not signed so his nieces and
nephews would inherit his money and property.
Who Killed Lord Lancaster?
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case of the hooded murderer
Lord Peter and Lady Violet Lancaster
GRADE 7
Lord Robert
Julian Lancaster
William Lancaster
Mark Manchester
Charles Lancaster
By George, I think theyve solved it.
The Dickens you say!
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CSI Cell Scene Investigators Fact or
Fiction

• Man is the highest of the animals therefore, he
  has the most chromosomes.
• An injury suffered in an accident will be passed
  on to ones children.
• If your parents both have brown eyes, you will
  certainly have brown eyes.
• You have inherited traits from individuals who
  are not your parents such as your aunt or uncle.
• Hereditary traits are carried from parent to
  child through the blood.

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CSI Cell Scene Investigators Fact or
Fiction

• Each person inherits exactly half of his genetic
  makeup from each parent.
• You inherit more from your mother if you are a
  girl.
• A parent may give a trait to his child without
  ever having the trait himself.
• If you resemble one parent more than the other,
  you probably inherited more from that parent.
• You have all the hereditary traits you are ever
  going to have at birth.

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Keeley, P., F. Eberle, and J. Tugel. 2007
Uncovering student ideas in science 25 more
formative assessment probes. Arlington, VA NSTA
press.

• Life Science Assessment Probe

Baby Mice
Seifs pet mouse had babies. Five of the babies
were black and two were white. The father mouse
was black. The mother mouse was white. Seif and
his friends wondered why the mice were different
colors. These were their ideas Jerome Baby
mice inherit more traits (genes) from their
fathers than their mothers. Alexa The baby mice
got half their traits (genes) from their father
and half from their mother. June Male traits
(genes) are stronger than female
genes. Seif Black mice have more traits (genes)
than white mice. Fiona The black baby mice are
probably male and the white baby mice are
probably male and the white baby mice are
probably female. Lydia Parents traits (genes)
like fur color dont matter nature decides what
something will look like. Billy Blood type
determines what traits (genes) babies will
have. Which friend do you most agree with and
why? Explain your thinking.
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The Case of the Hooded Murderer
Narrator The Lancasters were a large, wealthy
British family. Lord Roberts brothers and
sisters had all died before him, and he never
married. But he was scarcely alone. His twelve
nieces and nephews had moved into the houses on
the family estate. Lord Robert Lancasters body
was discovered by his nephew- Julian, who was
taken from the scene in handcuffs.
Court Records Last Will and Testament ____________
__________________________________________________
__________________________________________________
______________
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Letter from Julian Lancaster
Inspector Watson, I am writing this letter in a
most bereaved state of mind. I find myself in
the most precarious position of having to defend
my honor against the insidious accusation that I
have taken the life of my most beloved uncle,
Lord Robert Lancaster. Tis true, he had no
children of his own to leave his vast fortune to
however, the thought of murder never entered my
mind. Uncle had shown me a copy of his will and
I must say, I faired very well. I assure you,
Good Sir, I am innocent. I beg thee please
assist our local police in apprehending the true
culprit. My Penelope awaits me, for we are to be
married once I receive my inheritance. Since
rely, Julian Lancaster P.S. I am not the
only Lancaster with red hair!
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The Case of the Hooded Murderer
Narrator Inspector Watson received Julians
letter and decided to do a background
investigation. Inspector Watson had once planned
to be a biologist however, his passion for
mystery won out. His special interest was
genetics and heredity. He was particularly
interested in the Lancaster murder because of
certain patterns of inherited traits in the
family. This is his response
Court Records Last Will and Testament ____________
__________________________________________________
__________________________________________________
______________
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Watsons Reply

• Dear Julian,
• I find your situation most intriguing therefore,
  
• Mr. Holmes and I shall arrive at the Lancaster
• mansion by early morning to begin our official
• investigation.
• Sincerely,
• Inspector Watson

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Engage Your Brain

• What are your initial thoughts about this
  scenario?
• List the facts that you have been given.
• List the information you need to continue with
  hypotheses generation.

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The Search
Begins!!!!!
Mr. Holmes and Watson arrived at
the home of Lord Robert
Lancaster early morning as promised. As Watson
explained to Holmes, Old Lord Peter (Lord
Roberts father) is shown over the fireplace. As
a young man, he had bright red hair. His wife
Violet, was a brunette. Half their children,
including the late Lord Robert, had red hair the
others were brunettes. As only a recessive pair
of genes (aa) will produce red hair, each of Lord
Peters children received an (a) gene from him.
Watson went on, We know Lady Violet had (A)
genes because she was a brunette, and even one
(A) gene will produce brown hair. But Lady
Violet must have been heterozygous (Aa) because
half her children had red hair.
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Lord Peter Lancaster and Lady Violet Lancaster
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Explore This

• What are recessive genes? What are dominant
  genes?
• When representing genes, how are recessive genes
  differentiated from dominant genes?
• Why are two letters used to represent a trait,
  i.e. (aa) for red hair?
• What is the rule for expressing recessive genes?
• Why is only one (A) gene necessary to produce
  brunette hair?
• What does it mean for an individual to be
  heterozygous for a trait?
• What does it mean for an individual to be
  homozygous for a trait?
• How would you represent homozygous dominant
  genes?
• How would you represent homozygous recessive
  genes?
• How can you use this information to help you
  solve the murder?
• Prepare a vocabulary foldable.
• What other information do you need to proceed?

Our Story Continues.
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The Maids Account of the Mystery
Narrator In questioning the family servants,
Inspector Watson found a witness to the murder, a
maid who heard a groan from the library. Afraid
to go in, she had peep through the keyhole and
seen someone in a long hooded cape.
Do I dare tell the truth?
I couldnt even tell whether it was a man
or woman sir. But I did see a bit of red hair
sticking out from under the hood. The person had
a nervous habit of pulling on one earlobe, which
I noticed was not an attached ear lobe.
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By George, we both have attached ears lobes!
Aha said Watson. Earlobes, also, owe their
attachments to one pair of genes. A person who
is homozygous dominant (EE) or heterozygous (Ee)
has free earlobes, and someone who is homozygous
recessive (ee) has attached earlobes.
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The PLOT Thickens
Narrator The inspector began drawing up a chart
of the Lancaster family, using portraits and
family albums. Some information was not
available, but he learned three important pieces
of information. First, old Lord Peter Lancaster
had free ear lobes. Second, Lady Violet had
attached ear lobes. Third, some of their
children had attached ear lobes. By a strange
coincidence, Lord Roberts brothers and sisters
had all married persons having attached ear
lobes. Unfortunately, no pictures of the
suspects were available, and Inspector Watson had
not yet met them in person. The servants could
not remember whether the suspects had free or
attached earlobes, but of course they knew which
had red hair and which were brunettes. Watson
added that information to the chart.
Court Records Last Will and Testament ____________
__________________________________________________
__________________________________________________
______________
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Explain Your Thoughts!

• How does this change your list of facts?
• What hypotheses can you form now?
• What information would you like to have now?
• What type of chart could Inspector Watson have
  created to show family traits?
• Analyze Watsons chart and identify likely
  suspects.

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Elaborate on your logicWho Killed Lord Robert
Lancaster?

• You and your team represent Julians defense
  team.
• Unfortunately, Inspector Watson has no
  Jurisdiction
• in your district. You must take Inspector
  Watsons
• chart and prepare statistical data that proves
  Julians
• innocence. In order for Julian to obtain his
• inheritance and pay your fee, you must provide
• statistical data that proves who murdered Lord
• Lancaster. Finally, in your closing statement,
  you
• must provide a plausible scenario that explains
  any
• discrepancies between your suspect and the
  details
• provided by the eyewitness.

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The Jury Renders the Verdict
We must correct this mistake
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Heredity KWL

• Prepare a KWL foldable indicating
• what You know about genetics and
• heredity and DNA. After the
• opening activity complete what you
• would like to know about heredity.

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Start your heredity foldable
(Explore Activity) Explore activity Use the
notes presented by Watson and the pedigree chart
to answer the Explore questions. Prepare a
vocabulary foldable Hands on How do genes show
in offspring? Lab Can Chromosomes be seen?
(Remedial) Lab Do all corn seeds have genes for
becoming green plants? (Grade level) Lab How do
genes show in offspring of drosophila? (Extension)
Use pictures to represent the following heredity
vocabulary Dominant gene, Recessive gene, Pure
dominant, Pure recessive, genotype, phenotype,
Punnett square, pedigree