Male cones grow near (1)_____ the of the plant while female cones are located near the (2)_____.1- bottom or top?
2- top or bottom?
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2) top
The female cones are located at the top of the tree while make cones are at the bottom. The placement of cones is important in reproduction. Because cross-pollination between trees is desired. Wind will bring pollen from the male cone to female cones from other trees.
Answer: Male cones grow near (1) bottom the of the plant while female cones are located near the (2) top.
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q^2 = 11/100
q =
q = 0.33
Hope this helps
Answer:
The answer would be .33
Explanation:
d
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I took the test it's B
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Answer:
the cytoplasm is partitioned by the construction of a new cell wall, the cell plate, inside the cell.
Cytokinesis refers to cytoplasm and other organelles are physically separated to create two unique daughter cells. It completes the process of cell division and is the last stage of the cell cycle.
The cytoplasm of the cell, together with all the required organelles and cellular parts, are divided between the two daughter cells during cytokinesis. This guarantees that each new cell will have the framework and resources it needs to operate effectively.
Because plant cells have a cell wall, the specifics of cytokinesis can vary between animal and plant cells. The stiff cell wall in plant cells precludes the same kind of cleavage process that occurs in animal cells. Instead, in the center of the dividing cell, a structure known as the "cell plate" develops. Two distinct plant cells eventually arise as a result of the cytoplasm and other contents of this cell plate being divided as it expands.
Animal cells typically undergo a process known as cleavage in order to undergo cytokinesis. Just below the cell membrane, a protein ring that can contract slowly like a drawstring forms, pinching the cell into two distinct daughter cells.
To learn more about Cytokinesis, visit:
Although part of your question is missing, you might be referring to this full question: "What happens in the Cytokinesis stage of Cell Division?"
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1910
Thomas Hunt Morgan (1866-1945) establishes the chromosomal theory of heredity
Thomas Hunt Morgan, an embryologist who had turned to research in heredity, in 1907 began to extensively breed the common fruit fly, Drosophila melanogaster. He hoped to discover large-scale mutations that would represent the emergence of new species. As it turned out, Morgan confirmed Mendelian laws of inheritance and the hypothesis that genes are located on chromosomes. He thereby inaugurated classical experimental
After breeding millions of Drosophila in his laboratory at Columbia University, in 1910 Morgan noticed one fruit fly with a distinctive characteristic: white eyes instead of red. He isolated this specimen and mated it to an ordinary red-eyed fly. Although the first generation of 1,237 offspring was all red-eyed but for three, white-eyed flies appeared in larger numbers in the second generation. Surprisingly, all white-eyed flies were male.
These results were suggestive for hypotheses of which Morgan himself was skeptical. He was at the time critical of the Mendelian theory of inheritance, mistrusted aspects of chromosomal theory, and did not believe that Darwin's concept of natural selection could account for the emergence of new species. But Morgan's discoveries with white- and red-eyed flies led him to reconsider each of these hypotheses.
In particular, Morgan began to entertain the possibility that association of eye color and sex in fruit flies had a physical and mechanistic basis in the chromosomes. The shape of one ofDrosophila's four chromosome pairs was thought to be distinctive for sex determination. Males invariably possess the XY chromosome pair (Morgan used a more cumbersome notation) while flies with the XX chromosome are female. If the factor for eye color was located exclusively on the X chromosome, Morgan realized, Mendelian rules for inheritance of dominant and recessive traits could apply.
In brief, Morgan had discovered that eye color in Drosophilaexpressed a sex-linked trait. All first-generation offspring of a mutant white-eyed male and a normal red-eyed female would have red eyes because every chromosome pair would contain at least one copy of the X chromosome with the dominant trait. But half the females from this union would now possess a copy of the white-eyed male's recessive X chromosome. This chromosome would be transmitted, on average, to one-half of second-generation offspring—one-half of which would be male. Thus, second-generation offspring would include one-quarter with white eyes—and all of these would be male.
Intensive work led Morgan to discover more mutant traits—some two dozen between 1911 and 1914. With evidence drawn from cytology he was able to refine Mendelian laws and combine them with the theory—first suggested by Theodor Boveri and Walter Sutton—that the chromosomes carry hereditary information. In 1915, Morgan and his colleagues published The Mechanism
• Discrete pairs of factors located on chromosomes like beads on a string bear hereditary information. These factors—Morgan would soon call them genes—segregate in germ cells and combine during reproduction, essentially as predicted by Mendelian laws. However:
• Certain characteristics are sex-linked—that is, occur together because they arise on the same chromosome that determines gender. More generally:
• Other characteristics are also sometimes associated because, as paired chromosomes separate during germ cell development, genes proximate to one another tend to remain together. But sometimes, as a mechanistic consequence of reproduction, this linkage between genes is broken, allowing for new combinations of traits.
Morgan's experimental and theoretical work inaugurated research in genetics and promoted a revolution in biology. Evidence he adduced from embryology and cell theory pointed the way toward a synthesis of genetics with evolutionary theory. Morgan himself explored aspects of these developments in later work, includingEvolution and Genetics published in 1925, and The Theory of the Gene in 1926. He received the Nobel Prize in Physiology or Medicine in 1933.
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Answer:
A volcano that has erupted in the last 100 years called an "Active Volcano".
Explanation:
A volcano is a mountain that forms when the magma reached the surface to the earth. Magma reaches the surface because it is less dense than the solid rock around it.
An Active volcano erupts on a regular basis or it can erupt at any time and the results were devastated. examples of an Active volcano is mount Katmai in Alaska.