F1 Generation Cross F2 Generation (at least 500 flies) F1 red-eyed females x white-eyed males 50% of females are red-eyed and 50% are white- eyed 50% of males are red-eyed and 50% are white-eyed 21. The best explanation for the red-eyed F1 females is (A) mutation (B) culture contamination (C) dominance (D) multiple loci (E) sex-influenced traits 22. There are white-eyed females in the F2 generation because (A) white is a dominant allele (B) the white allele is autosomal (C) a mutation has occurred (D) these F2 females have two white alleles (E) the white allele is located on the Y chromosome 23. Which of the following best describes the mode of inheritance of eye color in the white culture? (A) Autosomal (B) Dominant (C) Located on the Y chromosome (D) Sex-linked (E) Lethal

F1 Generation Cross F2 Generation (at least 500 flies) F1 red-eyed females x white-eyed males 50% of females are red-eyed and 50% are white- eyed 50% of males are red-eyed and 50% are white-eyed 21. The best explanation for the red-eyed F1 females is (A) mutation (B) culture contamination (C) dominance (D) multiple loci (E) sex-influenced traits 22. There are white-eyed females in the F2 generation because (A) white is a dominant allele (B) the white allele is autosomal (C) a mutation has occurred (D) these F2 females have two white alleles (E) the white allele is located on the Y chromosome 23. Which of the following best describes the mode of inheritance of eye color in the white culture? (A) Autosomal (B) Dominant (C) Located on the Y chromosome (D) Sex-linked (E) Lethal

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter13: Genes, Chromosomes, And Human Genetics

Section: Chapter Questions

Problem 7TYK: In Drosophila, two genes, one for body color and one for eye color, are carried on the same...

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Item 10 10 of 15 > A cross in Drosophila melanogaster involved the recessive X-linked genes for white eye (w), yellow body (y), and cut wings (c). A wild-type tri-hybrid female was crossed with wild-type males and only the male offspring were tallied. On the basis of the results shown below, which of the choices shown best represents the genetic map of the three loci on the X-chromosome? Phenotype Male Offspring +у ct 63 W + + 60 w y ct 16 + + + 11 + + ct 4 w y + + у + 247 w + ct 197 5.5 mu 21.5 mu >< ct 5.5 mu 21.5 mu y ct 21.5 mu 5.5 mu ct 4.5 mu 20.5 mu y ct 20.5 mu 4.5 mu ct Submit Request Answer
Below you will find a spreadsheet of the "class" data, use this to complete data table 2. Remember, the class is a total of 24 students, to calculate frequency use the genotype with the highest frequency for each characteristic and divide that number by 24. Don't forget to answer the question on the bottom of page 107! Gender Letters XY XX Sex X, Y 11 13 XX Homozygous Heterozygous Homozygous Recessive Genotype highest frequency Characteristic Dominant Aa Eyebrows Eye Shape Hitchhikers А, а R, r 14 10 11 3 Rr Hh Н, h D, d Е, е F,f G, g В, Ь 15 Earlobes 4 8. 12 dd Ee Tongue Roll Widows Peak 7 10 13 Ff Face Shape 9. 12 3 Gg Eye Color 14 Bb MacBook Air esc 4) FI F2 F4 F5 F6 F8 F9 F10 F1I F12 @ # $ &
In Drosophila, two genes, one for body color and one for eye color, are carried on the same chromosome. The wild-type gray body color is dominant to black body color, and wild-type red eyes are dominant to purple eyes. You make a cross between a fly with gray body and red eyes and a fly with black body and purple eyes. Among the offspring, about half have gray bodies and red eyes and half have black bodies and purple eyes. A small percentage have: (a) black bodies and red eyes; or (b) gray bodies and purple eyes. What alleles are carried together on the chromosomes in each of the flies used in the cross? What alleles are carried together on the chromosomes of the F1 flies with black bodies and red eyes, and those with gray bodies and purple eyes?
Another gene in Drosophila determines wing length. The dominant wild-type allele of this gene produces long wings; a recessive allele produces vestigial (short) wings. A female that is true- breeding for red eyes and long wings is mated with a male that has purple eyes and vestigial wings. F1 females are then crossed with purple-eyed, vestigial-winged males. From this second cross, a total of 600 offspring are obtained with the following combinations of traits: 252 with red eyes and long wings 276 with purple eyes and vestigial wings 42 with red eyes and vestigial wings 30 with purple eyes and long wings Are the genes linked, unlinked, or sex-linked? If they are linked, how many map units separate them on the chromosome?
In cats, the genotype AA produces tabby fur color; Aa is also a tabby, and aa is black. Another gene at a different locus is epistatic to the gene for fur color. When present in its dominant W form (WW or Ww), this gene blocks the formation of fur color and all the offspring are white; ww individuals develop normal fur color. What fur colors, and in what proportions, would you expect from the cross AaWw Aa Ww?
l Metro by T-Mobile 1 2:29 PM • 16% I In flies, long wings are a dominant trait, and short wings are a recessive trait. Medium wings are the heterozygous trait. Based on this information, if a homozygous long-winged fly is crossed with another a heterozygous'fly, their offspring will have which percentages for long, medium, and short wings? Assume random chromosome segregation. 17) A) 25% long, 75% medium, 0% short B) 50% long, 25% medium, 25% short 50% long, 50% medium, 0% short D) 100% medium, 0% long, 0% short
23- In pea plants, axial flower position is dominant over terminal flower position. A student crosses a heterozygous axial flower with a plant with terminal flowers. What percentage of the plants will exhibit a homozygous genotype? a) 100% b) 0% c) 50% d) 75% 24- In pea plants, round seed is completely dominant over wrinkled seed. What genotype will result if a homozygous round seed plant is cross with a wrinkled seed plant? a. RR b. Rr c. Rr d. All of the above can be obtained
F1 female Drosophila heterozygous for cinnabar eye (cn), vestigial wings (vg) and roof wings (rf) genes were test crossed with males homozygous for all three traits. The following result were obtained. 382 cinnabar, vestigial 401 roof 3 cinnabar 4 roof, vestigial 59 cinnabar, roof, vestigial 67 wild 44 cinnabar, roof 40 vestigial The chromosomal interference is equal to? 0.24 0.32 0.42 0.58 0.49
13 Black coat color (B) in cocker spaniels is dominant to white coat color (b). Solid coat pattern (S) is dominant to spotted pattern (s). The pattern arrangement is located on a different chromosome than the one for color, and its gene segregates independently of the color gene. A male that is black with a solid pattern mates with three females. Indicate the genotypes of the parents. a) The mating with female A, which is white, solid, produces four pups: two black, solid, and two white, solid. b) The mating with female B, which is black, solid, produces a single pup, which is white, spotted. c) The mating with female C, which is white, spotted, produces four pups: one white, solid; one white spotted; one black, solid; one black, spotted.
Crossover frequencies for some genes on a tomato plant: • Normal leaves (M) and tall plant (D) 12% • Normal leaves (M) and normal tomato (O) 33% • Normal leaves (M) and simple florescence (S) 64% • Tall plant (D) and normal tomato (0) 21% • Tall plant (D) and simple fluorescence (S) 52% Draw a chromosome map and state the cross-over frequency between genes for a normal tomato and simple florescence.
18 The genes dumpy(dp) and clot(cl) are linked on chromosome II of Drosophila. A heterozygous female was testcrossed with a male. The progeny were • 11% dumpy. • 996 clot, • 4196 wildtype. 3996 dumpy-clot. What was the genotype of the heterozygous female? a) O dp dp"/cl cl D)O dp'dp/cl" cl DO dp'dp cl"cl 0 dp cl/ dp cl* e) O dpt cl/dp cl Boş bırak
Examine the set of three-point mapping data from Drosophilainvolving two dominant mutations [Stubble (Sb) and Lyra (Ly)]and one recessive mutation [bright (br)]. Identify the categoriesof data below (1–8) that are essential in establishing:(a) the arrangement of alleles in the crossover parent;(b) the sequence of the three genes along the chromosome;and (c) the interlocus distance between the genes.Phenotype Number(1) Ly Sb br 404(2) + + + 422(3) Ly + + 18(4) + Sb br 16(5) Ly + br 75(6) + Sb + 59(7) Ly Sb + 4(8) + + br 2 Total = 1000