Asked by marshae jones on Apr 24, 2024
Verified
Which of the following crosses will yield four phenotypes in the 1:1:1:1 ratio?
A) RRYY × RRYY
B) RRYY × rryy
C) RrYy × RrYy
D) RrYy × rryy
E) rryy × rryy
Phenotypes
The observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences.
Genotypes
The genetic makeup of an organism, representing the combination of alleles inherited from both parents.
- Utilize the rules of Mendelian genetics to determine expected outcomes for monohybrid and dihybrid crosses.
- Ascertain the ratios of phenotype to genotype in progeny stemming from various genetic crossing techniques.
Verified Answer
MM
Menaka Moorthy7 days ago
Final Answer :
D
Explanation :
Cross D (RrYy × rryy) will yield four phenotypes in a 1:1:1:1 ratio because it involves a dihybrid individual heterozygous for two traits being crossed with a homozygous recessive individual for those same traits. This results in equal probabilities of producing offspring with each of the four possible combinations of the two traits.
Learning Objectives
- Utilize the rules of Mendelian genetics to determine expected outcomes for monohybrid and dihybrid crosses.
- Ascertain the ratios of phenotype to genotype in progeny stemming from various genetic crossing techniques.