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Genetics

Genetics

Genetics: There's Allele Too Many Flies in Here True or False

1. Human, mice and fly males are _______ for loci on the X chromosome. -> Homozygous
2. A mutant phenotype refers to -> an abnormal, degenerative phenotype
3. In a sci-fi movie, a telekinetic man has all telekinetic daughters but sons with no telekinetic abilities. Their mother is just a regular human. What is a likely genetic basis for telekinesis in this plot? -> Mitochondrial
4. Coat color in creature X is determined by a single locus. When a true breeding black creature X and a true breeding yellow creature Y are crossed, all the resulting offspring are tan. What type of allelic relationship does this example represent? -> Genetic linkage
5. If the tan creatures Z are interbred, what are the resulting phenotypic frequencies in the next generation? -> 25% black, 50% tan, and 25% yellow
6. Linked genes tend to be inherited together because -> they are located close together on the same chromosome
7. In the fruit fly Drosophila melanogaster, a mutation in the wingless gene produces flies missing wings, and the mutant allele is recessive. What is the most likely outcome of a cross between two heterozygote flies? -> 46 winged and 54 wingless
8. Continuous traits -> are option 1 and 3
9. A floriculturist is interested in generating roses with larger petals. He measures the following components for petal radius in a population of plants from his farm.

Additive genetic variance (VA): 5.1
Dominance genetic variance (VD): 1.1
Interaction genetic variance (VI): 0.5
Environmental variance (VE): 3.0
Genetic-environmental variance (VGE): 0.1

What is the phenotypic variance? -> 0

10. What is the broad sense heritability? -> 1.0
11. What is the narrow sense heritability? -> 5.1

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