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In the whitefish how many chromosomes are there in a single set?
There are 40 chromosomes in a sperm cell of a white fish because the original number of chromosomes in a body cell is 80. Since the sex cells ( sperm and egg) each must contribute a set of chromosomes to the offspring, the sperm and egg both must have 40 chromosomes so they when the sperm and egg join or combine in a process known as fertilization, the offspring will have 80 chromosomes.
What must happen to the genetic material from each parent before sexual reproduction can occur?
The chromosomes from each parent sex cell must interact with each other in a process called crossing over. Crossing over allows the exchange of genes between the two chromosomes.
Why must a cell copy its chromosomes before it can go through mitosis?
When a cell copies its DNA, each chromosome must be copied.
Why are chromosome copied before mitosis?
After Mitosis, the result is 2 new, identical, daughter cells. In order for each to be identical, the chromosomes must be copied.
Why can female only pass only an x chromosome to offspring?
The female can only pass on ONE "X". an XX female offspring must get the second X from the father.
In the whitefish how many chromosomes are there in a single set?
There are 40 chromosomes in a sperm cell of a white fish because the original number of chromosomes in a body cell is 80. Since the sex cells ( sperm and egg) each must contribute a set of chromosomes to the offspring, the sperm and egg both must have 40 chromosomes so they when the sperm and egg join or combine in a process known as fertilization, the offspring will have 80 chromosomes.
Why is it necessary for sex cells to have fewer the number of chromosomes regular cells?
The sex cells must combine with each other to make a whole. Each gamete starts out with half of the regular cell so that it can combine to make a whole. If they start out like somatic cells, the result will be double the chromosomes for the offspring.
What must happen to the genetic material from each parent before sexual reproduction can occur?
The chromosomes from each parent sex cell must interact with each other in a process called crossing over. Crossing over allows the exchange of genes between the two chromosomes.
Why it is chromosomes not individual genes that assort independently?
For two genes to assort independently, they must reside on different chromosomes or be located far from each other.
Do all species have the same number of chromosomes?
No, chromosomes vary from species to species. A species is distinguished by individuals that can mate and have young that are capable of producing offspring. The number of chromosomes two individuals have must be the same for this to be possible.
Why must a cell copy its chromosomes before it can go through mitosis?
When a cell copies its DNA, each chromosome must be copied.
Why can female only pass only an x chromosome to offspring?
The female can only pass on ONE "X". an XX female offspring must get the second X from the father.
Why are chromosome copied before mitosis?
After Mitosis, the result is 2 new, identical, daughter cells. In order for each to be identical, the chromosomes must be copied.
Can horses breed with zebras?
Yes. But the hybrid offspring is sterile, owing to the different number of chromosomes in horses and zebras
Why is it important that sex cells have have the numbers of chromosomes as body cells?
Sex cells must have half the number of chromosomes because when the the sperm fertilizes the egg, the total number of chromosomes in the offspring must be the same number as the parents.Diploid and Haploid CellsBody cells (or somatic cells as they are called in Biology) have diploid, or 2n number of chromosomes. Male and female sex cells have haploid, or n number of chromosomes. During the process of fertilization where the sperm (containing n number of chromosomes) fertilizes the ovum (also containing n number of chromosomes), they collectively reconstitute the diploid number thus creating a fertilized cell containing 2n number of chromosomes (n from ovum and n from sperm) This fertilized egg now containing the entire chromosomal constitution of the species (2n) goes on to develop into an embryo.While in interphase, human cells are carrying out their normal functions and have 46 chromosomes, though the DNA does not exist as chromosomes at this point. For humans, 46 is known as the haploid number. Once a cell is ready to divide, the DNA (called chromatin) condenses into chromatids. The chromatids duplicate, forming the familiar X shapes, called chromosomes. At this point, one human cell contains enough genetic material for 92 chromosomes, double the normal amount. This is the diploid number. In mitosis, the cell divides in two, and each new cell each has 46 chromosomes worth of genetic material, the normal amount.In meiosis, which produces sex cells, the resulting cells must each have 23 chromosomes because in sexual reproduction, 23 chromosomes from father + 23 chromosomes from mother = 46 chromosomes in the offspring. In meiosis, the number of chromosomes doubles, creating the diploid amount. The cell divides, so 2 cells with 46 chromosomes are produced. These cells then divide without duplicated DNA, so 4 cells with 23 chromosomes are produced. Keep in mind that the number of chromosomes is not related to the complexity of the organism. Humans have 46 chromosomes, ferns have over 1,000.
What is gamete fusion?
It is the process during the formation of a zygote when two gametes, each carrying a different set of chromosomes, fuse together. This ensures that the developing zygote has a set of chromosomes from each parent and the cells can divide properly.The fusion of gametes is called sexual reproduction. There must be two gametes present for sexual reproduction to occur and they must have to correct number of chromosomes.
What must happen before meiosis can begin?
DNA replicates and forms tetrad—APEX.
