HMB265H1 Final: Study notes for lecture 2

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redtermite204

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HMB265H1 Full Course Notes

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Individuals with favourable traits chosen for breeding: ancestors had basic understanding of variable, heritable traits. Chose apt model organism: pea plant. Self-fertilizes: establish pure-breeding/inbred lines (genetically homogenous so same characteristics) Possessing discrete variable traits: v. continuous traits as in complex inheritance. Selfing: transferring pollen to stigma of same plant: repeated selfing increases homozygous proportion of offspring, v. cross-pollination: transfer pollen to another, anther- less plant. Trait of antagonistic pair always manifesting in hybrid: progeny from cross-pollination. Pure-breeding yellow and green peas cross: f1: yellow peas, f2: yellow and green peas in 3:1. Conclusions: biparental inheritance: both parents contribute hereditary material www. notesolution. com. Lecture 02: mendelian genetics for single gene traits: inherited traits are dominant (expressed in f1 hybrid) and recessive (silent in f1 hybrid, hereditary factors do not permanently modify each other. Mendel"s explanatory model: yy for pure-breeding yellow pea; yy for green.

Related Questions

Q6. Identify 2 scientific (genetic) reasons why scientists can justify working with model organisms when the ârealâ interest is in the genetics of other organisms.

7. The things that are True about animal breeding areâ¦(check all that are correct)

___a. animal breeders need to select the parents carefully

___b. breeding can only be done between 2 animals of the same species.

___c. animal breeders have a goal of improving a trait or traits in their breed or species of animal

___d. they all have the same traits they want to improve, no matter what the animal species or breed.

___e. animal breeders are only interested in traits for which selection is obvious and the genetic control or inheritance is easy to predict

___f. animal breeding is only done on domestic animals not wild animals

___g. animal breeding would be much easier if there was no variation within a species in the genes that control their traits.

___h. although slightly more difficult, breeding between 2 different species (ex. cat and dogs) can be done just as breeding within the same species.

Q8. Describe two differences and two similarities between plant breeding and animal breeding.

4) Because individuals survive, mate and reproduce rather than individual traits, we expect that many traits in an organism will be phenotypically and genetically correlated. List two of the possible evolutionary outcomes that can occur when selection operates on genetically correlated traits (1), and explain why these outcomes occur (3). Give an actual, not hypothetical, example for one of them using a real organism (1).

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HMB265H1 Final: Study notes for lecture 2

HMB265H1 Full Course Notes

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