Answer:
When you eat, food passes from the throat to the stomach through the esophagus. A ring of muscle fibers in the lower esophagus prevents swallowed food from moving back up. These muscle fibers are called the lower esophageal sphincter
Explanation:
For most genes on the human X chromosome, 100% of XY males with mutant allele on the X chromosome will express the mutant phenotype.
50 % of human sperm cells that carry an X chromosome. There is 50 % chances that daughter of any male will not carry the gene and can't pass it on and 50 % chance that sons do not have the gene and it will be healthy. 50% chance that son have inherited the gene and express the trait or disorder.
If a Egg is fertilizes by sperm with X chromosome then zygote will be a female ' XX'. If the Egg is fertilizes by sperm with Y chromosome , then zygote will be male 'XY'.
To learn more about human sperm cells here
brainly.com/question/276208
#SPJ4
The correct answer is option D
The places that has most extreme temperatures are desert and tundra.
The Desert region is known for its hot and dry climatic conditions. The temperature there is very high all around the year and the surviving there is a very difficult task. The plants and animals living there has some adaptations that helps them to live in the hot climate.
The Tundra region is known for its cold climate and the plants there is shrubs, herbs and the animals have some adaptations that helps them to live in cold climate.
Answer:
3. Separation of sister chromatids
Explanation:
Before entering mitosis or meiosis, DNA contained in a cell duplicates and and each chromosome will have two sister chromatids.
- In mitosis the sister chromatids separate to produce two daughter cells that have the same information as the original cell before the DNA duplicated.
- On the other hand, meiosis consists of two cell divisions. During meiosis I, homologous chromosomes separate, producing two daughter cells that have half the information the original cell had, but each chromosome still has two sister chromatids. During meiosis II, the sister chromatids separate, and each daughter cell produces two more daughter cells, that now have a single homologous chromosome of the pair, and which has a single chromatid.
As such sex is itself word,it's not like short form of any.
If you really bifurcate then it's like “s” means satisfaction,”e” excitement, experiment & enjoyment ,that come from “ X" factor of both men & women.
