Final answer:
A dihybrid cross is the kind of cross that contains two characters, unknown genotypes, and individuals that express two dominant traits.
Step-by-step explanation:
A cross that contains two characters, with unknown genotypes, and where individuals express two dominant traits is known as a dihybrid cross. In a dihybrid cross, two heterozygous individuals are crossed to produce offspring that can have various combinations of the two traits. In the example given, the possible genotypes for the yellow, round seed phenotype in the F2 generation are GGWW, GGWw, GgWW, and GgWw.
The question refers to a dihybrid cross where two dominant traits are expressed, with example genotypes being GGWW, GGWw, GgWW, and GgWw, commonly analyzed using a Punnett square to predict genetic outcomes.
The question is regarding a type of cross in genetics, which involves two different characters (traits), and the individuals involved express two dominant traits. This is known as a dihybrid cross, where genotypes are unknown, and two dominant traits are expressed. For example, in Mendel's pea plants, yellow and round seeds in the F2 generation suggest a mixture of genotypes including GGWW, GGWw, GgWW, and GgWw. These genotypes refer to homozygous and heterozygous combinations of genes responsible for color and shape. A Punnett square analysis is often used to predict these genotypes and the resulting phenotypic ratios in the offspring. In the given example of pea plants, 'G' may represent the gene for green/yellow color with 'G' being dominant for green, and 'W' may represent the gene for the shape of the seeds with 'W' being dominant for round.