Use the four possible combinations of alleles From each onion for color and taste to fill in the Punnett square below. This well illustrate a true di hybrid cross showing the Mendelian phenotypic ratio of 9:33:1

Biology 2e
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Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter13: Modern Understandings Of Inheritance
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Problem 2VCQ: Figure 13.4 Which of the following statements is true? Recombination of the body color and red/...
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Use the four possible combinations of alleles From each onion for color and taste to fill in the Punnett square below. This well illustrate a true di hybrid cross showing the Mendelian phenotypic ratio of 9:33:1
Genetics I LAB 11
Ratio
Phenotype
Red and Sweet
Red and Bitter
White and Sweet
White and Bitter
Figure 4. Example of a Dihybrid Cross for Onion Color and Taste.
Transcribed Image Text:Genetics I LAB 11 Ratio Phenotype Red and Sweet Red and Bitter White and Sweet White and Bitter Figure 4. Example of a Dihybrid Cross for Onion Color and Taste.
LAB 11 I Genetics
Part 3. Now that you can easily do a Punnett square for a monohybrid cross, let's go on to dihybrid
crosses. A dihybrid cross looks at two characteristics instead of one. For instance, we can look at the
cross between a parent who has red skin and sweet taste with a parent who has white skin and bitter
taste. The trick is to make sure you list every possible combination of alleles each parent can donate.
There are several ways to determine these combinations. One way is to "foil it out" (as you would
in algebra). Given the following information, try to work it out:
Onion skin color is denoted by the letter "R" with red (R) allele being dominant and white (r) allele
being recessive.
Taste we already denoted by the letter "B"; again, sweet (B) is dominant and bitter (b) is recessive.
If one parent is heterozygous for skin color (red) and heterozygous dominant for taste (sweet), the
onion genotype would be RrBb.
To figure out the four possible combinations of alleles the parent onion could donate, you could do this:
first
last
RrBb
outside
inside
Transcribed Image Text:LAB 11 I Genetics Part 3. Now that you can easily do a Punnett square for a monohybrid cross, let's go on to dihybrid crosses. A dihybrid cross looks at two characteristics instead of one. For instance, we can look at the cross between a parent who has red skin and sweet taste with a parent who has white skin and bitter taste. The trick is to make sure you list every possible combination of alleles each parent can donate. There are several ways to determine these combinations. One way is to "foil it out" (as you would in algebra). Given the following information, try to work it out: Onion skin color is denoted by the letter "R" with red (R) allele being dominant and white (r) allele being recessive. Taste we already denoted by the letter "B"; again, sweet (B) is dominant and bitter (b) is recessive. If one parent is heterozygous for skin color (red) and heterozygous dominant for taste (sweet), the onion genotype would be RrBb. To figure out the four possible combinations of alleles the parent onion could donate, you could do this: first last RrBb outside inside
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