A heterozygous diploid fungal strain undergoes meiosis to produce its haploid spores. The spores have a cell coat that is determined by a single gene Sc, with spores that have the Sc allele being green and the spores with the sc allele being colorless. The color of the spore supposedly has no effect on the viability of the spore or its development and production during meiosis. A random sample of 501 spores is collected from a plate of a sporulating heterozygous (Sc/sc) diploid mycelium, and 235 are colorless. Your goal is to test whether the supposition that spore color has no effect on meiotic spore production is supported or not. Explain in words and numbers what is an appropriate biological null hypothesis. Use the chi-square test to make your statistical determination about this sample.
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.
- 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.
answer; ///i believe its: ///(embolus);
"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:
1. high progesterone levels maintain the endometrium lining of the uterus.
2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.
3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.
4. rising estrogen levels suppress fsh production and development of other follicles.
5. a spike in lh causes follicle to rupture.
6. a breakdown of corpus luteum causes progesterone level to drop."