
Starting with a population of genetically identical dragonflies, you discover two new mutant lines that are...
Starting with a population of genetically identical dragonflies, you discover two new mutant lines that are wingless. In both lines, the wingless phenotype is inherited in a autosomal recessive pattern. You cross a wingless dragonfly from one mutant line to a wingless dragonfly from the other line. All the offspring from this cross (line 1 X line 2) have wings, therefore you conclude the mutation that caused the wingless phenotype in the lines: Select one: a. Was in two different...
4. You cross individuals with the following Genotypes, AaBbDdEeFFGg & AaBbDDEeFfGg. Predict the proportion of offspring that would show the following Phenotype or Genotype? A) all Dominant Phenotypes, B) the Genotype: AabbDdEeFfgg, C) the Genotype: AABbDdEeFfgg, D) the Genotype: aaBbddEeffGg, & E) all Recessive Phenotypes. 5. You cross individuals with the following Genotypes, AaBbDdEeFFgg x AabbDDEeFfGg. If you produce 1000 offspring in this cross, predict the number of offspring that would have the following Phenotype or Genotype? A) all Dominant...
5.) You have discovered mutants in two new gene mutants in Drosophila. One mutant, curl, has small, curly, nonfunctional wings. The other mutant, big, has enormous eyes. You decide to test if these two new genes are on chromosome #2, so you perform a three-gene linkage testcross using a gene that you know is on chromosome #2, trp, a mutant that cannot make its own tryptophan (and so must get it from its food). In all three cases, these mutant...
The wings of wild type fruit flies (Drosophila) are full; two recessive mutant strains express a different wing structure – one with scalloped wings and the other with reduced wings (smaller than normal). These are caused by two different mutations in the same gene. This gene is called scalloped. The gene symbol for scalloped is sd, where sd+= wildtype wings sd1= scalloped wings and sd2 = reduced wings Reciprocal crosses between the mutant true-breeding strains produced the following results: Cross...
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5.) You have discovered mutants in two new gene mutants in Drosophila. One mutant, curl, has small, curly, nonfunctional wings. The other mutant, big, has enormous eyes. You decide to test if these two new genes are on chromosome #2, so you perform a three-gene linkage testcross using a gene that you know is on chromosome #2, trp, a mutant that cannot make its own tryptophan (and so must get it from its food). In all three...
Among a collection of Drosophila mutants, you find two different lines of flies with increased numbers of body bristles. You are able to show that one line of flies has a dominant mutation while the other has a recessive mutation and the mutations are not linked. After mapping the dominant mutation by positional cloning to a candidate interval, you discover a previously reported a gene within this interval in which loss of function, recessive mutations cause decreased bristle number. You...
You are interested in mouse eye development and conduct a genetic screen for mutations that result in strong eye defects. After treating a male mouse with ENU (a chemical mutagen that induces base-pair changes and small deletions), you identify four mouse mutants 1-4, each with defective eyes. You cross each of the four mutant mice with eye defects to homozygous wild type mice and examine the progeny from each cross. What type of information can you get from observing the...
You discover a new plant species and you decide to conduct two mating experiments investigating mutant genes. The results from your experiment are outlined below. Which alleles are recessive? Parents F1 F2 1 Round x wrinkled All round seeds 5474 round; 1850 seeds wrinkled 2 Yellow x green All yellow seeds 6022 yellow, 2001 seeds green Select one around and wrinkled b.round and yellow winded and green dround and green inkled and yellow
U IS MOST COMMOT a population as a Select from the terms below to answer questions #17-22. One term is not used. R) Genomic imprinting S) Methylation T) Sex-influenced inheritance U) Maternal inheritance V) Sex-limited inheritance W) Complementation X) X-linked inheritance 17) Pattern baldness is controlled by two alleles: B, b. Females are bald if they are homozygous (BB) but males only need one allele B to be bald. This trait is an example of 18) A mother passes on...
3) Dihybrid cross: The dark-bodied and rudimentary winged genes are on two different autosomal chromosomes. We will use this cross to determine the ratios of phenotypes in the F2 generation when there are two genes involved. 3.1) Use the following symbols to write out the cross: Male: 3 Female: 9 Dark body color (ebony) = e Wild-type body color: E or E+ Rudimentary wings- (vestigial wings= v) Wild-type wings: V or V+ 3.2) What would the cross look like if...