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ewconnect mheducation.com/flow/connecthtm Sel. Ahia blogs Field of Hope D Special-Orhreyn A KERRI D E ?STOR Search Resu D strength and condi Help Seve& Exit Subm What percentage of offspring in a dihybrid cross in plants In pea plants, the allele for round seeds is dominant to the allele for wrinkled seeds. At another gene locus, the allele for yellow seeds both heterozygous at both gene loci, what percentage of the plants that produce round seeds will also produce yellow seeds? (Enter the number only without the percent sign. For example, enter 100% as soo and enter 12.5% as 12.5 ) Yellow seeds Green seeds K Prev 17 of 26 Next G S 5 8 9 ?// V?l B N M

Explanation / Answer

In the question, it is given that both the parent plants are heterozygous for both gene loci, hence there genotypes will be RrYy, where R denotes round seeds, r denotes wrinkled seeds and Y and y denote yellow and green seeds respectively. A cross between two RrYy plants can be shown as follows:

RrYy x RrYy (Parents)

RY Ry rY ry RY Ry rY ry (Gametes)

The genotypes that are shown in bold and are underlined show the plants with round and yellow seeds. The cross follows the Mendelian Dihybrid ratio of 9:3:3:1 with the percentage of plants as follows:

Gametes RY rY Ry ry RY RRYY RrYY RRYy RrYy rY RrYY rrYY RrYy rrYy Ry RRYy RrYy RRyy Rryy ry RrYy rrYy Rryy rryy

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