8 Fainting goats are a breed of goat that was selectively br

8. Fainting goats are a breed of goat that was selectively breed for the phenotype myotonia congenita -they don\'t actually faint. This phenotype is characterized by paralysis of skeletal muscles whenever the muscles experience a signal to tense up. In normal goats (and all other mammals), this signal occurs in response to being startled and lasts a few milliseconds. In fainting goats, the paralysis lasts several seconds. The goats become statue-like when startled but are still subject to the laws of physics, i e. conservation of momentum. Below is a pedigree analysis of goats expressing the myotonia congenita phenotype

Solution

6.a . autosomal recessive mode of inheritance

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b cl/+

CL/I

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IMAGE IS MISISNG

What is the probability that the goat with question mark is myotonic

IF

GENOTYPES

CL/cl           x       CL/cl          

CL

cl

CL    

CL/ CL                   

CL/cl          

cl          

CL/cl          

Affected cl /cl          

probability that the goat with question mark is myotonic =1/4=0.25

probability that the goat with question mark is myotonic

IF

GENOTYPES

CL/cl           x       cl/cl          

CL

cl

cl  

cl/ CL                   

Affected cl /cl         

cl          

CL/cl          

Affected cl /cl          

probability that the goat with question mark is myotonic =2/4=0. 5

probability that the goat with question mark is myotonic

IF

GENOTYPES

CL/CL           x       cl/cl          

CL

CL

cl  

CL /cl          

CL /cl          

cl          

CL/cl          

CL /cl          

probability that the goat with question mark is myotonic =0/4=0

	CL	cl
CL	CL/ CL	CL/cl
cl	CL/cl	Affected cl /cl