Suppose a geneticist uses a three-point testcross to map three recessive, linked hummingbird wing-shape mutations called tk, f, and s, where tk is associated with thick wings, f is associated with flat wings, and s is associated with sharp wings. He first crosses homozygous sharp birds to homozygous thick, flat birds. Next, he testcrosses the Fi progeny to thick, flat, sharp birds. He obtained the results shown. Given this data, label the progeny phenotypic classes as either parental, single crossover (SCO), or double crossover (DCO) recombinant types. Each label may be used multiple times. Two classes have already been filled in. Phenotype Number Recombinant type sharp 819 Answer Bank thick, flat 821 SCO DCO flat 183 parental thick, sharp 169 SCO thick 6. flat, sharp thick, flat, sharp 28 SCO wild type 26

Suppose a geneticist uses a three-point testcross to map three recessive, linked hummingbird wing-shape mutations called tk, f, and s, where tk is associated with thick wings, f is associated with flat wings, and s is associated with sharp wings. He first crosses homozygous sharp birds to homozygous thick, flat birds. Next, he testcrosses the Fi progeny to thick, flat, sharp birds. He obtained the results shown. Given this data, label the progeny phenotypic classes as either parental, single crossover (SCO), or double crossover (DCO) recombinant types. Each label may be used multiple times. Two classes have already been filled in. Phenotype Number Recombinant type sharp 819 Answer Bank thick, flat 821 SCO DCO flat 183 parental thick, sharp 169 SCO thick 6. flat, sharp thick, flat, sharp 28 SCO wild type 26

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter13: Observing Patterns In Inherited Traits

Section: Chapter Questions

Problem 9GP: In sweet pea plants, an allele for purple flowers. (P) is dominanl when paired with a recessive...

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In sweet pea plants, an allele for purple flowers. (P) is dominanl when paired with a recessive allele for red flowers (p). An allele for Jang pollen grains (L) is dominant when paired with a recessive allele for round pollen grains (L). Bateson and Punnett crossed a plant having purple flowers and long pollen grains with one having white flowers and round pollen grains. All F1 offspring have purple flowers and long pollen grains. Among the F2 generation, the researchers observed the following phenotypes: 296 purple flowers/long pollen grains 19 purple /lower/ round pollen grains 27 red flowers/long pollen grains 85 red flowers/round pollen grains What is the best explanation for these results?
Drosophila females heterozygous for each of three recessive autosomal mutations with independent phenotypic effects [thread antennae (th), hairy body (h), andscarlet eyes (st)] were testcrossed to males showingall three mutant phenotypes. The 1000 progeny of thistestcross werethread, hairy, scarlet 432wild type 429thread, hairy 37thread, scarlet 35hairy 34scarlet 33a. Show the arrangement of alleles on the relevantchromosomes in the triply heterozygous females.b. Draw the best genetic map that explains these data.c. Calculate any relevant interference values
QUESTION 2 A researcher crosses mice with brown eyes and short tails, and the F1 progeny were recovered in the following numbers and phenotypic classes: F1: 32 apricot, short : 30 brown, long : 139 brown, short : 9 apricot, long You know the genes encoding these traits are autosomal, completely dominant and assort independently. You want to use a chi-square test to analyse these results. a) Give the expected number of individuals in the "brown, short" class. b) What is your null hypothesis for the chi-square test? c) You obtain a value of 8.59 for the chi-square test. What conclusion can you make from the results of the chi-square test? d) Making use of the appropriate genetic convention for naming alleles, give the genotype of any of the progeny in the "apricot, short" class. df 0.995 0.975 0.9 0.5 0.1 0.05* 0.025 0.01 0.005 1 0.000 0.000 0.016 0.455 2.706 3.841 5.024 6.635 7.879 2 0.010 0.051 0.211 1.386 4.605 5.991 7.378 9.210 10.597 0.072 0.216 0.584 2.366 6.251 7.815 9.348 11.345…
5 & :56M ******* 24 DIHYBRID CROSSES DRV 0 Stv T alı A @ zladenA 9160p2-id2 bns obidalbaneoviene da II\ MOD YR 21 $59A ... Create a dihybrid cross and determine the expected phenotypic percentages of the offspring of two corn plants both of which are heterozygous for colour and texture (RrTt X RrTt). Don't forget to include clear let statements, and follow the all six steps taught on solving genetics problems. insig moni nellog: bna. zoom
LABORATORY EXERCISES IN GENETICS a. On the basis of this pedigree, what do you think is the most likely mode of inheritance for Duchenne Muscular Dystrophy? are most likly made op intentence for Duchenne Miscular Rysty Uale b. If couple III-7 and IlI-8 have another child, what is the probability that the child will have Duchenne Muscular Dystrophy? c. If IlI-2 and IlI-7 mated, what is the probability that one of their children would have the disease?
QUESTION 5 How would a corn kernel heterozygous for the color allele (Cc) sometimes get spots / streaks of color or no color? a. Under the influence of the Ac element, Ds is a transposable element that can jump in and out of the dominant Callele. b. The Ac & Ds elements are both transposable elements that can jump in and out of the recessive c allele. C. The P element only acts in the female part. d. Under the influence of the Ds elerment, Ac is a transposable element that can jump in and out of the dominant Callele. e. None of the above. QUESTION 6 Why does the P element cause hybrid dysgenesis only when a male fly with the P element mates with a female fly that does not have the P element? O a. Sperm cells contain little or no cytoplasm so there is no repressor protein contributed by the male. b. The P elements are linked on the same chromosome. C. The repressor protein in the female's egg, that keeps the P element from transposing, is not present. d. Both a andc e. All of the above…
QUESTION 6 In Drosophila, sepia eyes (se) and stubble bristles (sb) are recessive to the wildtype eyes and bristles (se* and sb+). A female heterozygous for both genes was test crossed to a male homozygous recessive for both genes. The progeny of this cross are given below: Phenotypes wildtype eyes and wildtype bristles (set, sbt) # of Progeny 334 widltype eyes and stubble bristles (set, sb) 162 sepia eyes and wildtype bristles (se, sb+) 158 sepia eyes and stubble bristles (se, sb) 346 What is the genetic distance (in map units) between these two genes? Are the alleles in the heterozygous female in the cis (coupling) or trans (repulsion) conformation? Are the two genes in this problem unlinked, completely linked or incompletely linked?
Question 5 [HINT: This problem wants you to calculate gene number from the proportion of individuals in the extreme classes, not from the number of phenotypes.] A farmer has two pure-breeding varieties of tomatoes: Little Pete (average fruit diameter 2cm) and Big Boy (average fruit diameter 14 cm). The farmer crosses Little Pete and Big Boy and obtains F1 plants with fruit averaging 8cm in diameter. When he intercrosses the F1s to obtain F2s, he examines 2000 F2 plants and finds two plants that produce fruit even smaller than Little Pete and three plants that produce fruit even larger than Big Boy. From these data, how many genes can we infer are involved in controlling fruit size in these plants? What is the genotype of Little Pete? What is the genotype of Big Boy? What is the genotype of the F1s? What are the genotypes that are bigger than Big Boy? What are the genotypes that are smaller than Little Pete?
Bb Take Test: Mod 9 Lab - Genetic X + ← ] C G QUESTION 3 In the pedigree below, all shaded individuals express the gene in question. For example, Arlene "has" the trait, she displays the phenotype in question. For example, if we were following the inheritance pattern of a widow's peak, Arlene has a widow's peak (that is NOT the trait here, just an example). Unshaded individuals (blank circles and squares) do not manifest the trait in question, but their specific genotype is unknown - they could be heterozygous, homozygous dominant, or homozygous recessive. What is the mechanism of inheritance of this trait? Sandra Daniel recessive dominant Tom 990 Alan QUESTION 4 George Sam Tina Christopher Arlene Wilma Ann O Carla R Update Michael In the pedigree below, all shaded individuals express the gene in question. For example, Arlene "has" the trait, she displays the phenotype in question. For example, if we were following the inheritance pattern of a widow's peak, Arlen a widow's peak (that…
Flies homozygous for recessive null mutations in thesevenless (sev) or bride-of-sevenless (boss) genes have the same mutant phenotype: Every ommatidium(facet) in their eyes lacks photoreceptor cell 7 (R7).The R7 cells enable flies to detect UV light.a. Given that flies normally move toward light, suggest a screening method that would enable you toidentify mutations in additional genes required forR7 determination.b. Would you be able to recover mutations in everygene required for R7 development with yourmethod? Explain.c. How could you tell whether any of the new mutationsyou found in your screen are alleles of sev or boss?d. Suppose you found one recessive mutant allele ofa gene not previously known to be involved in eyedevelopment. How could you use this allele in anew mutagenesis screen to find additional allelesof this gene? Why might you want additional mutant alleles to study the process?
dd-ons Help в I U A Calibri 12 三三1 |:三 6. Consider a guinea pig with a homozygous genotype and a white fur color phenotype. a. What is the probability this parent will produce a gamete with the dominant allele? b. What is the probability this parent will produce a gamete with the recessive allele? C. If 31 sperm cells are collected from this guinea pig, how many would you expect to have the recessive allele (as determined by sequencing the gene)? !!!
F1 hybrids between two species of cotton, Gossypium barbadenseand Gossypium hirsutum, are very vigorous plants. However, F1crosses produce many seeds that do not germinate and a high percentageof very weak F2 offspring. Suggest two reasons for theseobservations.