Mendelian Genetics and Punnett Squares GENETIC CONTINUITY, GREGOR MENDEL AND MONOHYBRID CROSSES.
3-15-10 IN Explain the purpose of a punnett square. Create your own monohybrid cross.
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Transcript of 3-15-10 IN Explain the purpose of a punnett square. Create your own monohybrid cross.
![Page 1: 3-15-10 IN Explain the purpose of a punnett square. Create your own monohybrid cross.](https://reader036.fdocuments.in/reader036/viewer/2022062713/56649cda5503460f949a421f/html5/thumbnails/1.jpg)
3-15-10 IN
Explain the purpose of a punnett square. Create your own monohybrid cross
![Page 2: 3-15-10 IN Explain the purpose of a punnett square. Create your own monohybrid cross.](https://reader036.fdocuments.in/reader036/viewer/2022062713/56649cda5503460f949a421f/html5/thumbnails/2.jpg)
3-15-10 Through
Analysis questions
OUT Study guide Look through your
notes preparing for the test. Begin to think about questions to ask me.
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1. Predict the possible phenotypes and genotypes of the offspring from a mating of two beagles. A heterozygous female with the dominant phenotype for droopy ears (D) mates with a male with recessive phenotype for upright ears (d).
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Predictions: Phenotypes-- 50% droopy 50% upright Genotypes --- 50% Dd(heterozygous)
50% dd(homozygous)
Dd dd
Dd dd
D d
d
d
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2. Describe the role of a Punnett square in predicting the potential ratio of genotypes that may result from a particular cross.
![Page 6: 3-15-10 IN Explain the purpose of a punnett square. Create your own monohybrid cross.](https://reader036.fdocuments.in/reader036/viewer/2022062713/56649cda5503460f949a421f/html5/thumbnails/6.jpg)
3. Recall that crossing-over causes some genes on the same chromosome to assort independently. What relationship might you expect between the spacing of genes on the chromosome and their frequency of independent assortment?
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4. Remember that the gene for eye color in fruit flies is linked to the X chromosome. Predict F1 and F2 results of a initial mating between a homozygous red-eyed female and a white-eyed male.
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XRXr XRXr
XRY XRY
XR XR
Xr
Y
F1
Predictions:
Genotypes: 100% males XRY 100% females XRXr
Phenotypes: males are Red-eyed
females are red-eyed
![Page 9: 3-15-10 IN Explain the purpose of a punnett square. Create your own monohybrid cross.](https://reader036.fdocuments.in/reader036/viewer/2022062713/56649cda5503460f949a421f/html5/thumbnails/9.jpg)
XRXR XRXr
XRY XrY
XR Xr
XR
Y
F2
Predictions:
Genotypes: If male, 50% XRY 50% XrY If female, 50% XRXR 50% XRXr
Phenotypes: Females are red-eyed, 50% males are red-eyed, 50% males are white-eyed
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5. Explain why males are more likely than females to display the phenotypes associated with X-linked recessive traits.
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6. Use your knowledge of X-linked traits to explain the inheritance of hemophilia in the story A royal tragedy.
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7. Consider how tall you are. How tall will you likely be when you are fully grown? How tall might you have been if you were raised in a very different situation? How do your genes and the environment interact to determine how tall you will be?