百度试题 结果1 题目How many times does DNA copy during meiosis? A. 1 B. 2 C. 3 D. 4 相关知识点: 试题来源: 解析 A 反馈 收藏
In the process of meiosis, how many viable eggs are produced by the female each time meiotic cell division occurs? Meiosis: Meiosis is the process by which a diploid cell (2n) undergoes division and produces a haploid cell (n). The cells which ...
here we go -- the moment when the male and female sex organs and sex cells get together. While there are many ways in which a man and a woman can engage in sexual behavior together,vaginal intercourse, in which a man's penis is ...
In what kind of cells can you find peroxisomes, and how many are in each cell? All glands are composed of the same general tissue. What is that tissue? How do the structural differences in the xylem and phloem reflect differences in function of the two types of vascular tissue?
the reproductive cells' progression through meiosis was derailed. In both cases, however, the newfound bumps in gene activity still took place. This suggested that signals from adjacent cells were not required for the observed spikes, and that even if the rest of meiosis fails, thesex cellsstill...
coli bacterium, cells of plants and animals have chromosomes that hold the DNA strands. Humans have 23 pairs of chromosomes, for a total of 46 chromosomes. Fruit flies have five pairs. Dogs have 39 pairs, and some plants have as many as 100. Chromosomes come in pairs. Each chromosome is...
For those species, male and female reproductive cells can be found on different flowers of the same plant -- similar to how many gymnosperms' pinecones are commonly configured. Or, in some cases, each particular plant specimen may feature only one or the other, varying the process slightly....
This and many other examples show that, when elements are both simple and functional, their usefulness tends to extend beyond the original context of their usage, which enables them to come together into unexpected, useful interactions at the system level. Consequently, the egg returns to the ...
Intransformation, the prokaryote takes up naked DNA found in its environment and that is derived from other cells that have lysed on death and released their contents, including their genome, into the environment. Many bacteria are naturally competent, meaning that they actively bind to environmental...
Libuda's lab studies the molecular mechanisms of DNA repair during meiosis, the process by which eggs and sperm are made. Errors during this process lead togenetic mutationsin vital reproductive cells, which can then get passed down through generations or cause infertility. ...