Dihybrid Cross YYRR yyrr P Generation F, Generation YyRr Phenotype: gametes from heterozygous parent yR YR Yr yr F2 Generation YR YYRR YYRR YYRI YyRr Phenotype: 9: 3: 3: yR YYRR yyRR YyRr yyRr Yr YYRI YyRr YYrr Yyrr yr YyRr yyRr Yyrr yyrr Figure 8.10 A dihybrid cross in pea plants involves the genes for seed color and texture. The P cross produces F1 offspring that are all heterozygous for both characteristics. The resulting 9:3:3:1 F2 phenotypic ratio is obtained using a Punnett square. In pea plants, purple flowers (P) are dominant to white (p), and yellow peas () are dominant to green (V). What are the possible genotypes and phenotypes for a cross between PPYY and ppYy pea plants? How many squares would you need to complete a Punnett square analysis of this cross? gametes from heterozygous parent

In roan cattle, red (R) and white (W) are codominant. Heterozygous individuals produce both red and white hairs, known as roan. When two roan cattle are crossed, what are the phenotypic ratios of the offspring?

Two true-breeding varieties of maize, one 11 cm high and the other 47 cm high were crossed and the resultant  F1 hybrids were then crossed to generate the  F2 . In the F2 there were a total of 13,923 plants with a continuous variation in heights between the two extremes and with only 3 plants as large as 47 cm high and 5 plants  of 11 cm high.SO In a cross between a 29cm plant and a 20cm plant what would be the genotypes giving the smallest number of different phenotypes? specify the phenotypes observed.

In tomatoes, regular leaves (L) are multilobed and serrated and potato leaves (l) are broad, smooth, and single (Image 1). Red fruit (F) is dominant to yellow fruit (f). A cross is carried out between two pure lines of tomato plants, one having regular leaves and red fruit and the other having potato leaves and yellow fruit. The F1 generation all have regular leaves and red fruit. The F1individuals are then crossed with one another. Complete a Punnett square to determine the expected F2 progeny on the basis of Mendel’s Law of Independent Assortment, which states that the alleles for one gene segregate independently of the alleles for other genes during gamete formation. The information below represents two sets of data collected from the above cross. Phenotypes Data Set 1 Data Set 2 Regular Red 26 846 Regular Yellow 15 273 Potato Red 6 287 Potato Yellow 12 94 Total 59 1 500   Convert the expected phenotype ratio into the expected probability for each of the four…