1. In corn, the genes an (anther ear), br (brachytic), and f (fine stripe) are linked. Testeross data are as follows: Progeny Number Progeny Number +++ 88 an ++ 355 ++f + br + + br f 21 2 an +f an br + 17 55 399 an br f Determine the linkage map and the genotype of the homozygous parents used to obtain the heterozygote for testeross.
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- Determining Gene Order 1. We want to map the distance between genes E (tall height), B (blue flower color), and G (thick stalk). Each geen has a recessive allele (e= short, b= white and g= thin). (The actual configuration of the Trihybrid will be deduces as a part of the process) A. Your testcross genotypes will be (use slash notation). Female: ______ Male:______ Based on these results, are the genes linked or not? _______mapping gene The genes for ruby eyes (rb), tan body (t) and cut wings (ct) are all found on the X-chromosome of Drosophila melanogaster. All of these are recessive traits. They map in the order rb, ct, t with 12.5 map units between rb and ct and 7.5 map units between ct and t. Suppose you cross a cut wing male with a homozygous female that is both tan and has ruby eyes. What will the F1 females look like? Draw map of the section of the X chromosomes that has these 3 genes for the F1 females Assume you testcross your F1 females. What progeny classes would you expect? ii. Give approximate numbers for each class based on a total of 2000 progeny. Assuming the i=1 and there are no double crossovers. Assuming the i=0 and there are the expected number of double crossovers.Linkage Mapping Using Dihybrid Testcrosses in Fruit Flies In fruit flies, the normal honey-gray body-color (bl*) is dominant to black (bl), having normal red eyes (pu+) is dominant to purple (pu), and having normal wings (vg+) is dominant to vestigial (vg). The three genes are located close together on the same chromosome. Your task is to use data from three dihybrid testcrosses to (1) calculate recombination frequencies, (2) convert recombination frequencies into map distances, and (3) build a map of the chromosome interval covered by the three genes, indicating their order and distances between them. BLACK PURPLE DIHYBRID CROSS In the parental generation, you mate a pure-breeding wild-type female (bl+/blt;put/pu+) with a pure-breeding black, purple male (bl/bl;pu/pu) to produce an F1 generation that is all wild-type (bl+/bl;pu*/pu). Note that the F1 flies are all dihybrid. Next, you mate several F1 dihybrid females (bl+/bl;pu*/pu) with tester males, which are black, purple…
- Changes in Chromosome Structure and Number 20. Six bands in a salivary gland chromosome of drosophila are shown here along with the extent of five deletions (Del 1 to Del 5):³ -1---2- -3------4- -6---- Del 1 Del 2 Del 3 Del 4 Del 5 Recessive alleles a, b, c, d, e, and fare known to be in this region, but their order is unknown. When wild-type individuals with the deletions are testcrossed to individuals recessive for all six genes, the following results are obtained (a minus sign indicates the wild-type allele is masking the expression of the recessive mutant allele, a plus sign indicates the recessive allele is being expressed). Use these data to infer which salivary band corresponds to each gene. b с + + + + Del 1 Del 2 Del 3 Del 4 Del 5 a + + + d + + eNeed help. Knowing that the Curly leaf (Cy) is a dominant gene on chromosome 6, as it is useful in tracking other genes using trisomics for chromosome 6. Assume a Cy Cy cy plant used as a pollen parent where disomic pollen does not function crossed to a Cy cy cy female where disomic eggs do function. A) What ratio would be predicted in the progeny of this cross? B) What if the reciprocal cross was made?Saved Gene linkage Complete the following statements about gene linkage. Not all choices will be used. independent A chromosome contains a long series of different are in a definite assortment that sequence linkage group Their position, or on the chromosome is fixed. locus alleles All of the alleles on a chromosome form a(n) they tend to be inherited together. because gametes Because they reside so close together on the chromosome, there is a reduced chance that not follow the traditional Mendelian genotypic ratios. will occur and therefore they do 30 acer
- Deletion mapping: In your diploid model organism, one copy of the chromosome has all normal, dominant alleles of these genes. It is P Q R STU V (not necessarily in that order). But the other copy of the chromosome has all recessive alleles, p q r stu v. You find various deletions in which chunks of the "dominant chromosome" are missing, and so there are recessive phenotypes as shown: Phenotype -- recessive for genes... T, Q, and U R, V, and S T and U S and V Q, P, and R R and S First deletion Second deletion Third deletion Fourth deletion Fifth deletion Sixth deletion Seventh deletion T and Q Figure out the order of the genes. Show some kind of work.7-5. In corn a pair of genes determines leaf shape and another pair determines pollen shape. A ragged-leafed plant with round pollen was crossed to a ragged-leafed plant with angular-pollen, and the resultant progeny were classified as follows: Class Phenotypes 186 ragged-leaf round-pollen 11 IV 174 ragged-leaf angular-pollen 57 smooth-leaf round-pollen Total 63/480 smooth-leaf angular-pollen (a) Using alphabetical letters of your choice, designate the genes for the different leaf and pollen characters. (b) On the basis of the symbols given in (a) 1 provide genotypes two parents. (c) (forth)/(nbers) According to your hypothesis what would you have expected for each of the four classes of progeny? (d) After re viewing Chapter 8, use the chi-square method (p. 132) to test your hypothesis and indicate whether you accept or reject it.Make a key for this problem. Use these symbols to show the cross for the P generation, the Chapter 14: Mendel and the Gene Idea 10. Figure 14.5 in your text explains how to construct a Punnett square for a cros bet true-breeding plants with purple or white flowers. You are going to reproduce this Goeen use symbols instead of pictures. offspring in the Fi generation, and both the cross and the offspring in the F2 generati, the dicate the alleles for each individual as well as the gametes it produces and complete Punnett square. Key: P Generation F, Generation F2 Generation Genetics problems have their own vocabulary, and you will have difficulties in solving them unless you master the following terms. Define the terms and give an example of each using the following symbols: 11. P = purple flowers p = white flowers homozygous heterozygous genotype phenotype parental cross monohybrid cross dihybrid cross -4- Copyright © 2021 Pearson Education, Inc.
- Drosohpila Punnet Square of Crosses. I need results of F1 & F2 generation using Punnett Squares for: Make Punnet Squares of the following crosses •Drosophila Female wildtype cross Male White-eye •Drosophila Male wildtype cross Female White-eye •Drosophila Female Wild Type cross Male Scarlet Eye •Drosophila Male Wild Type cross Female Scarlet Eye Also, Which allele is heterozygous and which is homozygous, & which is dominant and which is recessive?select whcih ic correct When 2 wildtype alleles are on the same parental chromosome, this is known as [Combined or Coupling or dispersed or heterozygous or Repulsion] . In sharp contrast [Combined or Coupling or dispersed or heterozygous or Repulsion] is when 1 wildtype allele and 1 mutant allele are on the same parental chromosomeThe parent in a crow AaBb and aabb respectively: Draw diagram for each showing the two different genes are linked. Show how the offspring in the coress are produced and clearly label the recombinants.