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BIOL3044 Lecture Notes - Lecture 19: Genetic Correlation, Ipomoea, Heritability

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indigobat594
13 Nov 2021
School
Dalhousie University
Department
Biology
Course
BIOL3044
Professor

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Document Summary

Found unexpected positive correlations to where they expected to find trade-offs. If an organism has a large pool of resources to draw from, they are able to put it into both fitness components. If an organism has a small pool of resources to draw from, they have less resources to put into their fitness components. Trade-offs might get hidden behind variation in the amount of resources that organisms are able to acquire. Trade-offs and the correlated response to selection: ex. Plants that produce large flowers can only produce few of them, while plants that produce small flowers can produce a lot of them. We expect to find a correlated response to selection. These beetles eat plants in similar species ipomoea purpurea and deloya guttata. Prediction: our prediction is that for a trade-off to limit or constrain adaptation, we expect there to be a negative genetic correlation between the two components of fitness.

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Related Questions

Assume that plant height and flower size in Four O'Clock plants display antogonistic phenotypes. Four O'Clock plants can be tall or short and the flowers can be large or small. Assume each trait is governed by alleles of a single gene and that each follows Mendel’s first and second laws. You start with two pure breeding strains, one that is tall with large flowers and a second that is short with small flowers. You cross these two strains to each other to generate F1 plants. You self-cross an F1 plant and grow 342 of the resulting seeds into plants. You find that 195 plants are short with large flowers, 62 plants are short with small flowers, 59 plants are tall with large flowers, and 26 plants are tall with small flowers.

You take each of the 26 plants that are tall with small flowers, self cross each of them and examine thousands of progeny plants. Among those thousands of plants you would expect to observe plants with which phenotypes? (Select 'Yes' or 'No' for each)

Yes No Tall with large flowers
Yes No Tall with small flowers
Yes No Short with small flowers
Yes No Medium height with medium size flowers
Yes No Short with large flowers
Yes No Can't tell from the information provided

Assume that plant height and flower size in Four O'Clock plants display antogonistic phenotypes. Four O'Clock plants can be tall or short and the flowers can be large or small. Assume each trait is governed by alleles of a single gene and that each follows Mendel’s first and second laws. You start with two pure breeding strains, one that is tall with large flowers and a second that is short with small flowers. You cross these two strains to each other to generate F1 plants. You self-cross an F1 plant and grow 342 of the resulting seeds into plants. You find that 195 plants are short with large flowers, 62 plants are short with small flowers, 59 plants are tall with large flowers, and 26 plants are tall with small flowers.

For the cross above- what is the phenotype of the F1 individuals?

A. Short with small flowers
B. Tall with small flowers
C. Medium height with medium size flowers
D. Short with large flowers
E.Tall with large flowers
F. Can't tell from the information provided

Please explain I'm really confused

Assume that plant height and flower size in Four O'Clock plants display antogonistic phenotypes. Four O'Clock plants can be tall or short and the flowers can be large or small. Assume each trait is governed by alleles of a single gene and that each follows Mendel’s first and second laws. You start with two pure breeding strains, one that is tall with large flowers and a second that is short with small flowers. You cross these two strains to each other to generate F1 plants. You self-cross an F1 plant and grow 342 of the resulting seeds into plants. You find that 195 plants are short with large flowers, 62 plants are short with small flowers, 59 plants are tall with large flowers, and 26 plants are tall with small flowers.

Which of the following alleles are likely loss-of-function alleles? (Select 'Yes' or 'No' for each)

Yes No The allele for tall plants
Yes No The allele for short plants
Yes No The allele for small flowers
Yes No The allele for large flowers