True breeding tall red flowered plants are crossed with dwar

True breeding tall red flowered plants are crossed with dwarf white-flowered plants. The resulting F1 generation consists of all tall pink flowered plants. Assuming that height and flower color are each determined by a single gene locus, predict the results of an F1 cross of the TrRr plants. List the phenotypes and predicted ratios for the F2 generation. Blood typing has been used to exonerate men in paternity cases. Which blood groups was the father NOT in order for him to be exonerated? What would you do to determine whether a black horse is pure bred for color? (Black is dominant; gray is recessive). Muscular dystrophy certain typed is sex linked. Unfortunately, most males die by age 17. Show, through Punnett squares, how females do not get this disorder. Be creative and make up a new allele that confers a heterozygote advantages. State what happens when people are homozygous in both the dominant and recessive states. You have round polka dolled round is dominant, and you cross this with a normal solid solid is recessive mouse. Show all possibilities with the Punnett squares of possible offspring. Polydactyly is a dominant trait, but appear less than 1% of the populations. Let\'s assume the P = .01 and p =, 99 set up a Punnett squarer and show all probabilities of genotypes and phenotypes. Roan horses are formed from true breeding red and white horses. Show this in a Punnett square. What is the most likely explanation for the trait above and why? What is the most likely trait and why?

Solution

1).

Assume that the gene coding for tall plants is T and the gene coding for dwarf plants is, t; T is dominant over. Similarly, the gene coding for red flowers is R and the gene coding for white flowers is r; R is incompletely dominant over r. Because it is given that the F2 resulted from pure breed had pink flowers.

Now, self-cross of heterozygotes will have the progeny with the following genotypes:

TtRr* TtRr -à T_ RR (3/16, tall, red), T_ Rr (6/16, tall, pink), T_ rr (3/16, tall, white), tt RR (1/16, dwarf, red), tt Rr (2/16, dwarf, pink), tt rr (1/16, dwarf, white)