BIO 200 Lecture Notes - Lecture 5: Mathematical Analysis, Zygosity, Gamete

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roselouse437

27 Jun 2015

School

University at Buffalo

Department

Biological Sciences

Course

BIO 200

Professor

Dr.Poulin

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Document Summary

Mendel"s work with sweet peas: noticed that previous theory of blended inheritance was not reality o. All offspring were purple: bred hybrids with each other. Counted number of offspring with purple flowers and number with white flowers. Gregor mendel"s five element model: parents transmit factors (genes) to offspring. Individuals receive two copies of each factor , one from each parent (one on each gamete) Factors vary and lead to different flavors or outcomes (alleles) They were all yellow and round (phenotype: the f2 generation showed four different phenotypes. Not always the same phenotype as one of the parental types. If traits were not independent, there would only be two types of resultant offspring (parental phenotypes) Example: you would only find yellow/smooth or green/wrinkly peas; there would be no yellow/wrinkled or green/smooth peas: sets of results don"t get passed on together.

Related Questions

1. A true breeding tall pea line is crossed with atrue breeding short line. The F1 plants are all short. The F1 arecrossed with themselves to produce an F2. If the difference (tallvs. short) is due to a single locus, what proportion of the F2individuals do you expect to be tall?

2. Imagine that a researcher crossed the peas in theexample above, and counted 100 F2. 86 were short. 14 were tall. Doa chisquare test to see whether the results conform to a singlelocus cross with the allele coding for short plants dominant to theallele coding for tall plants.

3. A clematis from a true-breeding line with whiteflowers and short corollas (line A) is crossed to a clematis from atrue-breeding line with deep red flowers and long corollas (lineB). The resulting offspring, the F1, are all pink-flowered, withcorollas of medium length. An individual from the F1 iscrossed to an individual from line A. The resulting F2 offspringare as follows: 25% white flowers and short corollas, 25% whiteflowers with medium corollas, 25% pink flowers with short corollas,25% pink flowers with medium corollas.
What is the most likely genetic mechanism determining flower colorand corolla length? If a plant from the F1 listed above were selfed(crossed with itself), what proportion of the F2 offspring wouldyou expect to be white flowered with short corollas?

4. A man and a woman walk into a genetic counselorâsoffice. They have just had a child diagnosed with situs inversus, acomplete transposition of the internal organs from left to right,and vice versus. This condition usually produces no obvioussymptoms. It is caused by an autosomal recessive allele. What isthe chance that their next child will have the same condition? Whatmight this suggest about the parents?
Another man and woman walk into the same office. The father is anachondroplasic dwarf. The mother is of normal stature. (Look upachondroplasia, it is a lethal dominant). What is the chance thattheir first child will be a dwarf?

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BIO 200 Lecture Notes - Lecture 5: Mathematical Analysis, Zygosity, Gamete

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