You are studying two traits in fruit flies: Eye color where there are two colors, brown and red, and wing shape where there are
straight and curled phenotypes. You mate two flies that are heterozygous for the genes that control both of these traits and get the following phenotypes in the following ratio: 9 red and straight; 3 red and curled; 3 brown and straight; 1 brown and curled. Considering these traits, which alleles separated at which stages of meiosis? Select one:a. Red segregated from brown in meiosis II, and straight segregated from curled in meiosis II.b. Red segregated from brown in meiosis I, and straight segregated from curled in meiosis II.c. Red segregated from brown in meiosis II, and straight segregated from curled in meiosis I.d. Red segregated from straight in meiosis I, and brown segregated from curled in meiosis II.e. Red segregated from brown in meiosis I, and straight segregated from curled in meiosis I.
Red segregated from brown in meiosis I, and straight segregated from curled in meiosis I.
Explanation:
According to independent assortment genes for different traits separate independent of each other. Hence in a dihybrid cross the progeny comes out in 9 : 3 : 3 : 1 ratio. Here the same ratio is observed in a dihybrid cross hence the two genes assort independently.
According to law of segregation, alleles of a gene separate from each other during gamete formation. It can be observed during meiosis I. Homologous chromosomes line up in random orientations in middle of the cells. The chromosomes cross over and then separate. Hence, here the red trait segregated from brown and straight segregated from curled in Meiosis I. It is called as reductional division as after it chromosome number reduces from diploid to haploid.
this just has to do with simple energy and momentum conservation as the energy from the wind creates oceanic currents that move in the same direction of the current
The water will move to the section with lower water concentration until it is balanced, however, I don't know which section has the sugar and which has the water. a is wrong because the membrane is semi-permeable, so water can go through, and d is wrong because it is provided the sugar cannot move across the membrane. Hope this helps some :)
The deer population would drastically be reduced with the slower rate of reproduction and predators that would kill more deer than can reproduce. The environment would likely also have a reduced population of predators for deer, since the food source is reduced.
