Concept Check 8 17. Mendel\'s dihybrid crosses produced phenotypes in a 9:3:3:1

Question

Concept Check 8 17. Mendel's dihybrid crosses produced phenotypes in a 9:3:3:1 ratio. We don't always see 9:3:3:1 ratios in dihybrid crosses, but nonetheless these altered ratios are simply modifications of the classic 9:3:3:1 ratio. True b. False Location: 4.4 Gene Interaction Takes Place When Genes at Multiple Loci Determine a Single Phenotype Gene Interaction with Epistasis Table 4.5 18. Yeast mitochondria have a tubular morphology. In a mutagenic screen, two mutants are isolated that have fragmented mitochondria instead of tubular mitochondria. To determine if these two mutations are at the same or different loci, the two mutants are crossed. The progeny all have tubular mitochondria. What do you conclude? The mutations are at different loci. The mutations are at the same locus Not endugh data is presented. a. c. ocation: 4.4 Gene Interaction Occurs When Genes at Multiple Loci Determine a Sing

Explanation / Answer

17.
Answer:
True

Explanation:
Mendel dihybrid ratio is seen in ideal conditions that are,
Mating is random
No linkage
Large sample size
No lethality

Most of the times, we observe ratios that are close to 9:3:3:1 if the sample size is sufficiently large depending upon the phenotype.

18.
Answer:
Option B is correct.

Explanation:
Allelism test: If two mutations are allelic (at the same locus), a cross between them produces a mutant phenotype in the F1. If two mutations are not allelic (at different loci), a cross between them produces WT phenotype in the F1.

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