Part C You continue your experiments with the black mutation on chromosome II. You cross the reciprocal translocation strain to the black pure line to generate F1 flies that are both translocation heterozygotes and Bb heterozygotes. As before, you testcross F1 males and females in two separate experiments. Cross F1 males x pure black females (Note: There is no crossing over in the F1 males.) F1 females x pure black males (Note: Crossing over may occur in the F1 females.) F2 Progeny 1/2 black, fully fertile 1/2 wild-type, semi-sterile 424 black, fully fertile 426 wild-type, semi-sterile 73 black, semi-sterile 77 wild-type, fully fertile What can you conclude from these results? Select the three correct statements. What can you conclude from these results? Select the three correct statements. The F2 progeny in both experiments contain recombinants. The F2 progeny contain recombinants only when F1 females are testcrossed. None of the F2 progeny classes require crossing over. Some of the F2 progeny classes require crossing over; others do not. Chromosome II is one of the chromosomes involved in the reciprocal balanced translocation.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

carbon

explanation:

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle

answer; nociceptive pain;