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This cross results in the expected phenotypic ratio of 9:3:3:1. Another example is listed in the table below and illustrates the process of a dihybrid cross between pea plants with multiple traits and their phenotypic ratio patterns. Dihybrid crosses are easily visualized using a 4 x 4 Punnett square.
Download QR code; In other projects Appearance. move to sidebar hide File; File history ... English: This diagram illustrates a dihybrid cross using a Punnett square ...
The forked-line method (also known as the tree method and the branching system) can also solve dihybrid and multi-hybrid crosses. A problem is converted to a series of monohybrid crosses, and the results are combined in a tree. However, a tree produces the same result as a Punnett square in less time and with more clarity.
When conducting a dihybrid test cross, two dominant phenotypic characteristics are selected and crossed with parents displaying double recessive traits. The phenotypic characteristics of the F1 generation are then analyzed. In such a test cross, if the individual being tested is heterozygous, a phenotypic ratio of 1:1:1:1 is typically observed. [8]
Autosomal dominant A 50/50 chance of inheritance. Sickle-cell disease is inherited in the autosomal recessive pattern. When both parents have sickle-cell trait (carrier), a child has a 25% chance of sickle-cell disease (red icon), 25% do not carry any sickle-cell alleles (blue icon), and 50% have the heterozygous (carrier) condition. [1]
F1 crosses in animals can be between two inbred lines or between two closely related species or subspecies. In fish such as cichlids , the term F1 cross is used for crosses between two different wild-caught individuals that are assumed to be from different genetic lines.
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Date/Time Thumbnail Dimensions User Comment; current: 22:18, 16 March 2008: 769 × 589 (97 KB): YassineMrabet {{Information |Description=An example of pedigree chart.