If the parent or offspring genotypes or phenotypes are known, thepattern of inheritance can be predicted. Two organisms, withgenotypes BbDD and BBDd, are mated. Assuming independentassortment of the two loci, which of the following genotypic ratios inoffspring would occur?A) 1 BBDD: 1 bbddB) 1BBDD: 1 BbDD: 1 BBDd: 1 BbDdC) 9 BBDD: 3 BbDD: 3 BBDd: 1 bbddD) 1 BBDD: 2 BbDd: 1bbdd
Question
If the parent or offspring genotypes or phenotypes are known, thepattern of inheritance can be predicted. Two organisms, withgenotypes BbDD and BBDd, are mated. Assuming independentassortment of the two loci, which of the following genotypic ratios inoffspring would occur?A) 1 BBDD: 1 bbddB) 1BBDD: 1 BbDD: 1 BBDd: 1 BbDdC) 9 BBDD: 3 BbDD: 3 BBDd: 1 bbddD) 1 BBDD: 2 BbDd: 1bbdd
Solution
To solve this problem, we need to create a Punnett square for each gene separately, assuming independent assortment.
For the first gene (B/b): Parent 1 (Bb) can produce two types of gametes: B and b. Parent 2 (BB) can produce one type of gamete: B.
So, the possible combinations for the first gene are BB and Bb.
For the second gene (D/d): Parent 1 (DD) can produce one type of gamete: D. Parent 2 (Dd) can produce two types of gametes: D and d.
So, the possible combinations for the second gene are DD and Dd.
Combining these possibilities for both genes, we get the following genotypes: BBDD, BbDD, BBDd, and BbDd.
Therefore, the correct answer is B) 1BBDD: 1 BbDD: 1 BBDd: 1 BbDd.
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