Parents of Cross #1 elect Cross Female: +; N = 1 ✓ Male: AR, PR ST.M..C..RI, D..J.; N = 1 Q Select to Mate Q Select to Mate Offspring of Cross #1 Female AR; N = 123 Male..AR; N = 115 Female:.D; N = 145 Male:.D; N = 124 0 Select to Mate Select to Mate Q Select to Mate Select to Mate Offspring of Cross #1 Female AR; N = 123 Male..AR; N = 115 Female: .D; N = 145 Male:.D; N = 124 Select to Mate Select to Mate Q Select to Mate ૧ Select to Mate Female: AR, ST; N = 141 Male: AR, ST.; N = 113 Female: STD; N = 119 Male: ST..D; N = 136 Q Select to Mate Q Select to Mate Q Select to Mate Q Select to Mate

. A three-point testcross was made in corn. The results and a recombination analysis are shown in the display below, which is typical of three-point testcrosses (p = purple leaves, + = green; v = virus-resistant seedlings, + = sensitive; b = brown midriff to seed, + = plain). Study the display, and answer parts a through c.

In cats, the genotype AA produces tabby fur color; Aa is also a tabby, and aa is black. Another gene at a different locus is epistatic to the gene for fur color. When present in its dominant W form (WW or Ww), this gene blocks the formation of fur color and all the offspring are white; ww individuals develop normal fur color. What fur colors, and in what proportions, would you expect from the cross AaWw Aa Ww?

n corn, male sterility is controlled by maternal cytoplasmic elements. This phenotype renders the male part of the corn plants (i.e the tassel) unable to produce fertile pollen; the female parts, however, remain receptive to pollination by pollen from male fertile corn plants. However, the presence of a nuclear fertility restorer gene F restores fertility to male sterile lines sing the cardboard chips, simulate the crosses indicated below. Give the genotypes and phenotypes of the offsprings in each cross, and properly label the nucleus and the cytoplasm of each individual in the cross Legend male sterile cytoplasm Male fertile cytoplasm FF nucleus Ff nucleus ff nucleus A. Male sterile female x FF male Explain the phenotype of the offspring B. Male sterile female x Ff male Explain the phenotype of the offspring