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8 Cards in this Set
- Front
- Back
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Gene Interaction:
Pleiotropic Traits |
This is the ability of a single gene to have multiple effects.( when one gene affects many different characteristics)
Examples: Cystic Fibrosis and Sickle Cell |
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Type of Crosses:
Codominance |
Instances in which the heterozygote simultaneously expresses the phenotypes of both types of homozygotes.
Example : Sickle Cell and blood type AB |
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Mendelian Laws
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Segregation - two copies of a gene separate from each other during transmission from parent to offspring.
Independent Assortment - two different genes will randomly assort their alleles during the formation of haploid cells |
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Gene Interaction:
Epistasis Traits |
Condition in which certain alleles of one locus alter the expression of alleles of a different locus.
Example: Labrador Retrievers |
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Gene Interaction:
Polygenic Traits |
When multiple independent pairs of genes have similar and additive effects on the same character.( traits that are determined by more than one gene).
Example: Height, body form and skin pigmentation. |
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Type of Crosses:
Dominance |
It is not always complete therefore it is not always accurate to speak of dominant and recessive conditions for certain traits.
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Type of Crosses:
Incomplete Dominace |
Instances in which the heterozygote is intermediate in phenotype.
Example: A cross between red and white flowered plants gives plants with pink flowers in four o'clock plants. |
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Drosophilia
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Thomas Hunt Morgan carried out an experiment rearing fruit flies (red eyes,w+) in the dark to produce offspring whose eyes would atrophy but there was no change even with mutation treatments, then a true breeding line produced a white eye male,w. He made crossed F1 g had red eyes, illustrating dominant. F1 offspring mated to each other to obtain F2 of 1wmale,1w+male and 2w+female....results indicated eye color alleles are located on the x chromosomes, genes physically located on the x chromosome are called x-linked genes.
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