How is the full number of chromosomes restored?
During reproduction, when the sperm and egg unite to form a single cell, the number of chromosomes is restored in the offspring. Meiosis begins with a parent cell that is diploid, meaning it has two copies of each chromosome.
What does fertilisation do to the number of chromosomes?
Fertilisation in humans
When egg and sperm cells combine in fertilisation, they merge the two sets of chromosomes, ending up with 46 chromosomes in total. The maternal chromosomes from the egg cell and the paternal chromosomes from the sperm cell pair up. The resultant cell is called a zygote.
Does fertilization restores a full set of chromosomes to a gamete?
Fertilization joins two haploid gametes into a diploid zygote, the first cell of a new organism. … During fertilization, haploid gametes come together to form a diploid zygote and the original number of chromosomes (2n) is restored.
How does fertilization restore the diploid number of chromosomes?
The process of meiosis, the division of the contents of the nucleus that divides the chromosomes among gametes, reduces the chromosome number by half, while fertilization, the joining of two haploid gametes, restores the diploid condition.
Which of the following best describes how a diploid number of chromosomes is restored?
Which of the following best describes how the diploid number of chromosomes is restored in the offspring of these organisms? … Meiosis produces daughter cells with half the number of chromosome sets of the parent cell; therefore, the parent cell must be diploid.
How is the diploid chromosome number restored after halving in meiosis?
a. The restoration of the diploid chromosome number after halving in meiosis is due to fertilization.
How is diploid status restored in haploid cells?
During meiosis the cell produces gametes, or germ cells, each containing half the normal or somatic number of chromosomes. This condition is called haploidy. When two germ cells (e.g., egg and sperm) unite, the diploid condition is restored.
How many chromosomes are there when the egg is fertilized?
When an egg and sperm are united during fertilization, the resulting zygote has 23 pairs of homologous chromosomes, one in each pair from the egg and one from the sperm.