Loose Leaf For Integrated Principles Of Zoology
18th Edition
ISBN: 9781260411140
Author: Cleveland P Hickman Jr. Emeritus, Susan L. Keen, David J Eisenhour Professor PhD, Allan Larson, Helen I'Anson Associate Professor of Biology
Publisher: McGraw-Hill Education
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Chapter 5, Problem 8RQ
Summary Introduction
To determine: The genotype of the gametes and flower color of the offspring.
Introduction: Genotype is the genetic makeup of an organism. Offspring receive two sets of chromosomes in which each set belong to each parent.
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Consider three genes L, U, and W, for which the count of F2 phenotypes after a 3-point cross is as follows:
Phenotype F2 count:
L U w
19
L u W
1
l u W
21
L U W
33
l U W
274
l u w
41
l U w
2
L u w
259
Which of the following statements about genes L, U, and W are TRUE? (may be more than one correct ans)
A. L, U, and W are each on a different chromosome
B. Only U and L are on the same chromosome
C. Only U and W are on the same chromosome
D. Only W and L are on the same chromosome
E. L, U, and W are all on the same chromosome
+ ec +/Y
+ + w/Y
y ec +/Y
+ ec +/y ec w
++ w/y ec w
у ес +у ес и
Determine the order in which the three loci y, ec, and w
Occur on the chromosome and prepare a linkage map.
7.22 A cross involving X-linked genes was made between
yellow, bar, vermilion female fies and wild males, and the F1
females were crossed with y B v males. The following
phenotypes were obtained when 1000 progeny were exam-
ined:
Dra
ord
ma
the
7.2
546
244
160
50
+ + +
+ Bv
y Bv
y+ +
y+v
y B+
and
an
and
and
and
+B +
re
+ + v
ge
Determine the order in which the three loci occur on the
chromosome and prepare a linkage map.
7.23 Female Drosophila heterozygous for ebony (e"le),
scarlet (st*/st), and spineless (ss*/ss) were testcrossed, and
the following progeny were obtained:
PROGENCY PHENOTYPES
NUMBER
ir
Wild type
Ebony
Ebony, scarlet
Ebony, spineless
Ebony, scarlet, spineless
Scarlet
67
8.
68
347
78
368
Scarlet, spineless
Spineless
(a) Are these genes linked? Justify your answer. (b) Write the
genes given on a…
In snapdragons, red flower color (R) is incompletely dominant over white flower color (r). The hybrids or heterozygous plants (Rr) are pink in color.
a) Show the genotype for a white flower and for a red flower.
b) If a red-flowered plant is crossed with a white-flowered plant, what are the genotypes and phenotypes of the F1 generation plants?
c) What genotypes and phenotypes will be produced in the F2 generation?
d) How did the genotypic and phenotypic ratio compare to each other in this incomplete dominance cross?
e) What would the phenotypic ratio have been if this had been complete dominance?
f) What kind of offspring can be produced if a red-flowered plant is crossed with a pink-flowered plant?
g) What kind of offspring is/are produced if a pink-flowered plant is crossed with a white-flowered plant?
Chapter 5 Solutions
Loose Leaf For Integrated Principles Of Zoology
Ch. 5 - What is the relationship between homologous...Ch. 5 - Describe or diagram the sequence of events in...Ch. 5 - What are the designations of the sex chromosomes...Ch. 5 - Prob. 4RQCh. 5 - Diagram by Punnett square a cross between...Ch. 5 - Prob. 6RQCh. 5 - Assuming brown eyes (B) are dominant over blue...Ch. 5 - Prob. 8RQCh. 5 - Prob. 9RQCh. 5 - Prob. 10RQ
Ch. 5 - Assume that right-handedness (R) is genetically...Ch. 5 - Prob. 12RQCh. 5 - Prob. 13RQCh. 5 - Distinguish the following: euploidy, aneuploidy,...Ch. 5 - Prob. 15RQCh. 5 - Prob. 16RQCh. 5 - Prob. 17RQCh. 5 - Prob. 18RQCh. 5 - Prob. 19RQCh. 5 - Prob. 20RQCh. 5 - Prob. 21RQCh. 5 - Why do many mutations have no detectable effects...Ch. 5 - Distinguish between proto-oncogene and oncogene....Ch. 5 - Prob. 24RQCh. 5 - Outline the essential steps in the polymerase...Ch. 5 - Prob. 26RQCh. 5 - Prob. 27RQCh. 5 - Prob. 1FFT
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- Assume that the trihybrid cross AABBrr x aabbRR is made in a plant species. Assume that A and B are dominant alleles, but there is no dominance effect of alleles at the R locus. a) How many different gametes are possible in the F1generation? What are the genotypes of these gametes? b) What is the probability of the parental aabbRR genotype in the F2 progeny? c) What proportion of the F2 progeny would be expected to be homozygous for all three genes?arrow_forwardThe following results are derived from crosses between Neurospora strain xy and strain ++: Tetrad Class 3 4 ху x+ x+ xy ++ ++ ++ +y +y ху +y 25 ++ 3 124 4 (i) Name the ascus type of each class from 1 to 4 as P, NP or T. (ii) Are genes x and y linked? Explain your answer. (iii) If they are linked, determine the map distance between the two genes. If they are unlinked, provide all the information you can about why you draw this conclusion.arrow_forwardExplain at the biochemical or enzymatic level, the phenotypic consequencesof alleles incase of following cross. Rr (pink flower) x Rr (pink flower) (progeny are 1 RR (red flower) :2 Rr (pink flower): 1rr(white flower) how alleles contribute to a phenotype through metabolism.arrow_forward
- In tomato, the following genes are located on chromosome 2: + tall plant d dwarf plant + uniformly green leaves m mottled green leaves + smooth fruit p pubescent (hairy) fruit Results of the cross +++ / dmp and dmp / dmp were: + + + = 470 + m p = 1 + + p = 14 d + p = 25 d + + = 0 d m p = 441 + m + = 19 d m + = 30 Identify the single and double crossovers among the progeny.arrow_forwardDraw a preliminary linkage map of the three loci. What is their order? (E.g. is the forked locus between yellow and cross-veinless, or outside this region?) As this is a preliminary linkage map - do not account for double crossovers. You should base the distances on this map off your map distances calculated: yellow and forked: 39.3 mu yellow and cross-veinless: 11.9 mu cross-veinless and forked: 33.6 muarrow_forwardIn a cross between a white-eyed female (ww) and a red-eyed male (w+Y), nearly all the progeny were either red-eyed females (w+w) or white-eyed males (wY). However, about 1 in every 2000 F1 flies had an "exceptional phenotype" and was either a white-eyed female or red-eyed male. How did Bridges explain this unexpected result? A) Crossing over B) Incomplete cytokinesis C) Incorrect synapsis D) Nondisjunction E) Pseudoautosomal regionarrow_forward
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