CAMPBEL BIOLOGY:CONCEPTS & CONNECTIONS
10th Edition
ISBN: 9780136538820
Author: Taylor
Publisher: INTER PEAR
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Chapter 9, Problem 17TYK
SCIENTIFIC THINKING The breakthrough that led Bateson and Punnett to recognize the existence of linked genes (Module 9.17) was the appearance of unexpected results after they crossed double heterozygous pea plants (PpLI) with each other. Imagine that you have a group of Labrador retrievers that are all heterozygous for both coat color and blindness (BbNn). If you used this group of dogs to produce 160 puppies, how many puppies of each
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An ear of corn has a total of 381 grains, including 216 Purple & Smooth, 79 Purple & Shrunken, 65 Yellow & Smooth, and 21 Yellow & Shrunken. This ear of corn was produced by a dihybrid cross (PpSs x PpSs) involving two pairs of heterozygous genes resulting in a theoretical (expected) ratio of 9:3:3:1. Test your hypothesis using chi square.
H0 = outcome will always be at a 9:3:3:1 ratio
H1 = outcome will not follow 9:3:3:1 ratio
Grain Phenotype
Observed number
Observed Ratio
Expected Ratio
Expected Number
(Observed no. – Expected no.) ^2 / Expected number
Purple and smooth
216
10.3
9
381x 9/16 = 214
(216-214) ^2 = 4/214 = 0.019
Purple and shrunken
79
3.8
3
381x 3/16 = 71
(79-71) ^2 = 64/71 = 0.901
Yellow and smooth
65
3.1
3
381x 3/16 = 71
(65-71) ^2 = 36/71 = 0.507
Yellow and shrunken
21
21
1
381x 1/16 = 24
(21-24) ^2 = 9/24 = 0.375
Total…
Mendelian Genetics Punnett Square Question :
In cattle, the hornless condition (H) is dominant to that for the possession of horns (h).
a) A horned bull is mated to a hornless cow which is heterozygous . What kind of offspring are to be expected and in what ratio ?
b) If the cow is then mated to a hornless bull which is also heterozygous, what is the chance that the first calf will have horns ?
c) Assuming that the first calf has horns, what is the chance that the second calf will be hornless ?
Chapter 9 Solutions
CAMPBEL BIOLOGY:CONCEPTS & CONNECTIONS
Ch. 9 - Connecting the Concepts 1. Complete this concept...Ch. 9 - Whether an allele is dominant or recessive depends...Ch. 9 - Edward was found to be heterozygous (Ss) for...Ch. 9 - Two fruit flies with eyes of the usual red color...Ch. 9 - A man with type B blood and a woman who has type A...Ch. 9 - Tim and Jan both have freckles (see Module 9.9),...Ch. 9 - Both Tim and Jan (problem 6) have a widows peak...Ch. 9 - In rabbits, black hair depends on a dominant...Ch. 9 - A fruit fly with a gray body and red eyes...Ch. 9 - A series of matings shows that the recombination...
Ch. 9 - A couple are both phenotypically normal, but their...Ch. 9 - Why do more men than women have colorblindness?Ch. 9 - In fruit flies, the genes for wing shape and body...Ch. 9 - Adult height in humans is at least partially...Ch. 9 - Heather was surprised to discover she suffered...Ch. 9 - In 1981, a stray black cat with unusual rounded,...Ch. 9 - SCIENTIFIC THINKING The breakthrough that led...
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