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EBK BIOLOGY: CONCEPTS AND APPLICATIONS
9th Edition
ISBN: 8220100477805
Author: STARR
Publisher: CENGAGE L
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Chapter 17, Problem 2CT
Summary Introduction
To determine:
The possible problems that breeders should anticipate with the mating of Rama, a llama – camel hybrid with another hybrid of the same type.
Introduction:
In 1998, scientists bred a llama with a camel to produce a hybrid that would be having the strength and endurance of a camel and gentle disposition of llama. Unlike expectations, the born hybrid, named Rama, was smaller than everyone’s expectations and had a short temper that was found in camel. This inheritance of unwanted characters is a result of inheritance of undesired traits from both the parents in Rama.
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Students have asked these similar questions
Rama the cama, a llama-camel hybrid, was born in 1998. The idea was to breed an animal that has the camel's strength and endurance, and the llama's gentle disposition. However, instead of being large, strong, and sweet, Rama is smaller than expected and has a camel's short temper. The breeders plan to mate him with Kamilah, a female cama. What potential problems with this mating should the breeders anticipate?
You are excited to be entering the world of chinchilla breeding!
At the most recent chinchilla pet event you purchased a lovely grey chinchilla with large ears. You do some research and learn that Grey is dominant to white (Gg), and large ears are dominant to small (Ee). Your chinchilla breeding mentor has many combinations of chinchillas and he gives you a one-time offer to breed with any of this chinchilla!
List all of the possible genotypes for your chinchilla:
How could you determine which of these is the genotype of your chinchilla? How do we call this type of mating?
Read in your textbook about positive assortative mating. In this example, from your text, positive
assortative mating is 100% (i.e. there is no random mating). Note that the frequency of
heterozygotes is cut in half each generation. Does this match your answers above? Look at the
actual values make sure you understand why positive assortative mating leads to an increase in
homozygosity.
(a) Only heterozygotes
produce heterozygote
offspring, but only 50%
of the time
Homozygote
parent for A,
Heterozygote
parent
Homozygote
parent for A,
Eggs
A,
A,
Eggs
A2
A,
Eggs
A2
A2
A, A, A, A, A,
A, A, A, A, A2
A2 A2 A2 A2 A2
A, A, A, A, A,
A, A, A2 A2 A2
A2 A2 Az A2 A2
(b) Effect of extreme
inbreeding (self-
fertilization)
over time
A, A,
Homozygote
A, A2
Heterozygote
A2 A2
Homozygote
The arrows represent
A, p= 0.5 offspring genotypes
that are produced
by each parental
genotype
Generation 1
Az q = 0.5
100%
25%
50%
25%
100%
A, p= 0.5
Az q= 0.5
Generation 2
100%
25%
50%
25%
100%
The frequencies
of…
Chapter 17 Solutions
EBK BIOLOGY: CONCEPTS AND APPLICATIONS
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