BIOL201 Lecture Notes - Genotype

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burgundyoyster582

11 Apr 2014

School

University of Alberta

Department

Biology (Biological Sciences)

Course

BIOL201

Professor

Michael Harrington

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Document Summary

Biology 207 - practice questions 11 - gene interactions. Question 3 a true-breeding red flower plant was crossed to a true-breeding white flower plant. When f1 x f1 matings were made, the following f2 progeny were observed: Propose a complete genetic explanation for these results. Your answer should include: the number of genes involved; which chromosomes they are on, your own allele symbols (clearly defined); the genotypes of the p, f1, and f2 plants; a description of any genetic interactions; and a biochemical pathway.

Related Questions

A cross is made between homozygous fruit flies that differ for eye color (the st gene) and body color (the e gene). The F1 double heterozygote is shown below using chromosome notation. st+ e / st e+ st = the recessive allele for scarlet eyes; st+ = the dominant wildtype allele for red eyes e = the recessive allele for ebony body; e+ is the dominant wildtype allele for gray body.Are the chromosomes shown in the genotype above in cis or trans configuration? Based on this notation, what were the genotypes and phenotypes of the two parents of the F1?

lemonbeetle571

Wild type flies have brick-red eyes. Flies can also havebright-red eyes. This trait is determined
by a recessive allele, called "scarlet" & labeled as "st". Thedominant allele of this gene is labeled
as "st+". Thus, flies with the genotype "stst" will have bright-redeyes, & flies with the genotype
"st+st+" or "st+st" will have Wild type eyes. Flies can also havebrown eyes. It is also a recessive
trait determined by the gene "brown". Flies with the genotype"brbr" will have brown eyes, &
flies with the genotype "br+br+" or "br+br" will have Wild typeeyes. If you cross flies with brightred
eyes & flies with brown eyes, all the offspring will have Wildtype eyes. A) What are the
genotypes of P & F1 flies? If you cross 2 F1 flies, you observe9/16 Wild type, 3/16 brown, 3/16
scarlet, & 1/16 white-eyed flies. B) Explain these results?

aquamarinegnu855

In Drosophila, the autosomal recessive brown eye color mutation (b) displays interactions with both the X-linked recessive vermilion mutation (v) and the autosomal recessive scarlet (s) mutation. Flies homozygous for brown and simultaneously hemizygous or homozygous for vermilion have white eyes. Flies simultaneously homozygous for both the brown and scarlet mutations also have white eyes. Flies that are wildtype at all 3 loci have wildtype eye color. Flies that are homozygous or hemizygous for the recessive mutant at only one locus show that mutations color. (i.e. brown, vermillion or scarlet).
Use this information to answer the next 4 questions.

Predict the F1 progeny of a cross between a true breeding scarlet female X brown male.

a)	females wild type males scarlet

b)	females scarlet males wildtype

all white

d)	all wildtype

BIOL201 Lecture Notes - Genotype

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