In a cross between pure-breeding tall plants with pure-breeding short plants performed by Mendel, all of the F1 are tall. When these plants are allowed to fertilize themselves, the F2 plants occur in a ratio of 3 tall to 1 short. Which of the following is NOT a valid conclusion from these results? O A. The allele that produces the tall condition is dominant to the allele that produces the short condition. O B. The difference between tall and short stature in these lines is controlled by a single gene pair. O C. Fertilization occurs randomly between gametes carrying the tall and short alleles. D. The tall and short traits assort independently of each other in this cross. E. During production of gametes in F1 plants, the tall and short alleles segregate from each other equally into the gametes. Reset Selection VMark for Review What's This?

. In common wheat, Triticum aestivum, kernel color is determined by multiply duplicated genes, each with an Rand an r allele. Any number of R alleles will give red, anda complete lack of R alleles will give the white phenotype.In one cross between a red pure line and a white pureline, the F2 was 6463 red and 641 white.a. How many R genes are segregating in this system?b. Show the genotypes of the parents, the F1, and the F2.c. Different F2 plants are backcrossed with the whiteparent. Give examples of genotypes that would give thefollowing progeny ratios in such backcrosses: (1) 1 red :1 white, (2) 3 red :1 white, (3) 7 red :1 white.d. What is the formula that generally relates thenumber of segregating genes to the proportion of redindividuals in the F2 in such systems?

In triffid plants, the color trait and the spikiness trait are controled by two loci that assort independently. A true-breeding smooth green strain of triffids is crossed to a true-breeding spiky orange strain of triffids.  All of the F1 are spiky green.  The geneticist then performs two additional crosses: 1. she allows the F1 to self-fertilize 2. she crosses a plant from the F1 to a smooth orange strain. Choose all statements that are TRUE: Group of answer choices orange is dominant spiky is dominant all the progeny resulting from cross 1 (the selfing) will be smooth all the plants resulting from cross 2 will be orange green is dominant all the progeny resulting from cross 1 (the selfing) will be spiky smooth is dominant there will be mixture of smooth and spiky plants in the progeny resulting from cross 1 (the selfing) All the plants resulting from cross 2 will be green there will be a mixture of green and orange plants in the progeny resulting from cross 2

In a dihybrid cross of two bi-allelic Mendelian genes, A (two alleles – completely dominant A and recessive a), and B (two alleles – completely dominant B and recessive b), such that the parental generation comprises of pure-bred homozygotes (i.e. AABB with aabb), what are the expected genotype and phenotype ratios in the F1 and F2, if the F1 cross is (a) an intercross and if the F1 cross is (b) a testcross