During one of the genetics lab, you notice a few Drosophila fruit fly that has a rainbow body. You transfer the rainbow bodies flies into a separate vial. That vial of rainbow-bodies flies is left untouched for several months. As all flies in the vial continue to be blue-bodied, you assume they are true-breeding (homozygous). You want to determine the mode of inheritance of rainbow body flies so set up crosses using wild-type flies. You obtained 120 flies in each of your F1 crosses, fill in the tables with the expected numbers for F1, if the rainbow body trait is: wild-type female x Mutant male Male Female wild type mutant wild type male-mutant female Male Female wild type mutant

During one of the genetics lab, you notice a few Drosophila fruit fly that has a rainbow body. You transfer the rainbow bodies flies into a separate vial. That vial of rainbow-bodies flies is left untouched for several months. As all flies in the vial continue to be blue-bodied, you assume they are true-breeding (homozygous). You want to determine the mode of inheritance of rainbow body flies so set up crosses using wild-type flies. You obtained 120 flies in each of your F1 crosses, fill in the tables with the expected numbers for F1, if the rainbow body trait is: wild-type female x Mutant male Male Female wild type mutant wild type male-mutant female Male Female wild type mutant

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Description: During one of the genetics lab, you notice a few Drosophila fruit fly that has a rainbow body. You transfer the rainbow bodies flies into a separate vial. That vial of rainbow-bodies flies is left untouched for several months. As all flies in the via

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter20: Chromosomes And Human Genetics

Section: Chapter Questions

Problem 7CT: The following pedigree shows the pattern of inheritance of red-green color blindness in a family....

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Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are dominant to green (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares would you need to complete a Punnett square analysis of this cross?
During one of the genetics lab, you notice a few Drosophila fruit fly that has a rainbow body. You transfer the rainbow bodied flies into a separate vial. That vial of rainbow-bodied flies is left untouched for several months. As all flies in the vial continue to be rainbow-bodied, you assume they are true breeding (homozygous). You want to determine the mode of inheritance of rainbow body flies so set up crosses using wild type flies. You finally get the cross results, and they are as follow:F1 result Wild-type MutantP: Wild-type female X Mutant male 0 258P: Wild-type male X Mutant female 0 193F2 result Wild-type MutantF1 male x F1 female 268 205a) Based on the proportions, what is the most likely mode of inheritance?b) You need to perform a statistical test to confirm the mode of inheritance. State the null hypothesis.c) What is the Chi-square value for F2? Show your calculationsd) What conclusion can you make from these results?
A geneticist from an alien planet that prohibits genetic research brought with him two true-breeding lines of frogs. One frog line croaks by uttering “rib-it rib-it” and has purple eyes. The other frog line croaks by muttering “knee-deep knee-deep” and has green eyes. He mated the two frog lines, producing F1 frogs that were all utterers with blue eyes. A large F2 generation then yielded the following ratios: (a) How many total gene pairs are involved in the inheritance of both eye color and croaking? (b) Of these, how many control eye color, and how many con- trol croaking? (c) Assign gene symbols for all phenotypes, and indicate the genotypes of the P1, F1, and F2 frogs. (d) After many years, the frog geneticist isolated true-breeding lines of all six F2 phenotypes. Indicate the F1 and F2 phenotypic ratios of a cross between a blue, mutterer and a purple, utterer.
The pedigree shown below shows the inheritance of cystic fibrosis, a disorder that causes severe damage to the lungs and digestive system. Individual 5 shows no family history of cystic fibrosis and is considered to be homozygous for the normal allele. What is the probability that individual 10 is a carrier for the allele leading to cystic fibrosis?
In humans, the genes for colorblindness and hemophilia are both located on the X chromosome with no corresponding gene in the Y. These are both recessive alleles. If a man and a woman, both with normal vision, marry and have a colorblind son, draw the Punnet square that illustrates this. If the man dies and the woman remarries a colorblind man, draw a Punnet Square showing the type of children that could be expected from the second marriage. How many/what percentages of each could be expected.
A geneticist crosses two yellow mice with straight hair and obtains the following progeny: 1/2 yellow straight, 1/6 yellow fuzzy, 1/4 gray straight and 1/12 gray fuzzy What additional cross might be carried out to determine if your explanation is correct? Note: recessive lethal epistatis
The pedigree below shows three generations of a family that carries albinism, an autosomal recessive genetic disease. In the third generation, a child was born with albinism but the genotypes of the rest of the family are unknown. No other family members have the disease. Assume normal, Mendelian genetics with no new mutations. What are the genotypes of the parents of the affected child? A) There is not enough information to determine their genotypes B) Both are homozygous for albinism C) One is hemizygous and one is heterozygous for albinism D) Both are heterozygous for albinism E) One is homozygous and one is heterozygous for abinism
Let’s say we are crossing flies with a “big head” mutant trait with flies that have normal sized heads. If the mutant allele in this cross is a dominant, autosomal allele, when phenotype(s) should be present in the F1 of your cross, and what fraction of the F1 should each phenotype represent?
In Drosophila, white eyes (w) are recessive to red eyes (w+) at one locus and black body (b) is recessive to gray body (b+). A homozygous white eyes, gray bodied female is crossed with a homozygous red eyes, black bodied male to produce the F1 progeny. The F1 progeny are testcrossed and produce the following progeny: White eyes, black body: 212 White eyes, gray body: 288 Red eyes, black body: 308 Red eyes, gray body: 192 Does the evidence indicate that w and b loci are linked? Explain why or why not? If they are linked, what is the map distance between the two loci? If they are not linked, what is the map distance between the two loci? If they are linked, are the allels in the F1 in coupling or repulsion? How do you know? Draw the genotypes of all individuals described in the problem (original parents, F1, testcross, and F2 progeny) using the appropriate notation.
In a cross involving polygenic inheritance, three (3) gene pairs control plant height. The shortest andtallest plants are 12 cm and 24 cm, respectively. What height should all F1s display if the shortest andtallest plants were crossed, assuming environmental factors are the same?
The tiny blue-eyed Mary flower is often one of the first flowers seen in the spring in some regions of the United States. The flower is normally blue, but sometimes a white or pink flower variation is found. The following data were obtained after several crosses. A student claims that these flower colors are an inherited trait, and the F1 and F2 phenotypes of the flowers arising from the pink and white cross can best be explained by epistasis, where another gene product influences phenotype expression. This data supports this claim because in order to produce a __________ (pink, white, or blue) flower, a gene for a switch that 'turns on' the color gene would be recessive, meaning it has a mutation that causes it to be 'off'. In order to express a color, this switch needs to be in the dominant form. The color gene is a structural gene that has two variants: a dominant trait, ______ (pink, white, or blue) and a recessive _______ (pink, white, or blue) variety.
The following pedigree shows what type of inheritance?