Who Killed. Lord Robert Lancaster?.
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Lord Robert Lancaster?
Lord Robert Lancaster’s body – with a long dagger protruding from the chest- lay sprawled in his library. A draft of Lord Robert’s 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?
Lord Peter and Lady Violet Lancaster
By George, I think they’ve solved it.
The Dickens you say!
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
Seif’s 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: Parent’s traits (genes) like fur color don’t 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.
Narrator: The Lancasters were a large, wealthy British family. Lord Robert’s 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 Lancaster’s body was discovered by his nephew- Julian, who was taken from the scene in handcuffs.
Last Will and Testament
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.
P.S. I am not the only Lancaster with red hair!
Narrator: Inspector Watson received Julian’s 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:
Last Will and Testament
I find your situation most intriguing; therefore,
Mr. Holmes and I shall arrive at the Lancaster
mansion by early morning to begin our official
List the facts that you have been given.
List the information you need to continue with hypotheses generation.Engage Your Brain
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 Robert’s 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 Peter’s 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.
Our Story Continues…….
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
“I couldn’t 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.”
“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.”
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 Robert’s 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.
Last Will and Testament
Unfortunately, Inspector Watson has no Jurisdiction
in your district. You must take Inspector Watson’s
chart and prepare statistical data that proves Julian’s
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.Elaborate on your logic…Who Killed Lord Robert Lancaster?
We must correct this mistake…
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.
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