Multiple Choice
In a dihybrid cross where both parents have black fur and black eyes (assuming both traits are dominant and parents are heterozygous for both genes), what is the expected phenotypic ratio among the offspring?
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2. Mendel's Laws of Inheritance
Dihybrid Cross
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A cross where we follow the inheritance of two pairs of alleles is called:
A
Monohybrid cross
B
Back cross
C
Test cross
D
Dihybrid cross
Verified step by step guidance1
Understand the terminology: A 'monohybrid cross' involves tracking the inheritance of a single pair of alleles, while a 'dihybrid cross' involves two pairs of alleles.
Recall that a 'back cross' is a cross between a hybrid organism and one of its parents or an organism genetically similar to its parent, used to study inheritance patterns.
Recognize that a 'test cross' is used to determine the genotype of an individual showing a dominant phenotype by crossing it with a homozygous recessive individual.
Since the problem asks about following the inheritance of two pairs of alleles, identify that the correct term is 'dihybrid cross' because it involves two traits, each with two alleles.
Summarize that the dihybrid cross allows us to observe how two different traits are inherited together, often using a Punnett square with 16 possible genotype combinations.
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