What ratios result when three genetic traits are analyzed together in a hybrid cross?

What ratios result when three genetic traits are analyzed together in a hybrid cross?

Expert Solution

It is the cross between the two individuals of a species for studying the inheritance of three pairs of factors is known as trihybrid cross.

Let the three traits are AABBCC and aabbcc

The f1 generation will be AaBbCc. The gametes formed are: ABC, ABc, AbC, aBC, Abc, aBc, abC and abc.

The self cross will give the following result:

AaBbCc	ABC	ABc	AbC	aBC	Abc	aBc	abC	abc.
ABC	AABBCC	AABBCc	AABbCC	AaBBCC	AABbCc	AaBBCc	AaBbCc	AaBbCc
ABc	AABBCc	AABBcc	AABbCc	AaBBCc	AABbcc	AaBBcc	AaBbCc	AaBbcc
AbC	AABbCC	AABbCc	AAbbCC	AaBbCC	AAbbCc	AaBbCC	AabbCC	AabbCc
aBC	AaBBCC	AaBBCc	AaBbCC	aaBBCC	AaBbCc	aaBBCc	aaBbCC	aaBbCc
Abc	AABbCc	AABbcc	AAbbCc	AaBbCc	AAbbcc	AaBbcc	AabbCc	Aabbcc
aBc	AaBBCc	AaBBcc	AaBbCc	aaBBCc	AaBbcc	aaBBcc	aaBbCc	aaBbcc
abC	AaBbCc	AaBbCc	AabbCC	aaBbCC	AabbCc	aaBbCc	aabbCC	aabbCc
abc.	AaBbCc	AaBbcc	AabbCc	aaBbCc	Aabbcc	aaBbcc	aabbCc	aabbcc

The phenotypic ratio is 27 : 9 : 9 : 9 : 3 : 3: 3: 1.

It has 64 genotypic combinations. The genotypic ratio is

1 : 2 : 1 : 2 : 4 : 2 : 1 : 2 : 1 : 2 : 4 : 2 : 4 : 8 : 4 : 2 : 4 : 2 : 1 : 2 : 1 : 2 : 4 : 2 : 1 : 2 : 1.

gladiator answered 2 years ago

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