When a single chromosome replicates what is the result?
Well, DNA’s arranged in chromosomes, as you know, so what happens is, as a chromosome replicates, or makes a copy of itself, it’s arranged as two chromosomes next to each other, called chromatids.
What is a single chromosome called?
Human sperm and eggs, which have only one homologous chromosome from each pair, are said to be haploid (1n). When a sperm and egg fuse, their genetic material combines to form one complete, diploid set of chromosomes.
What happens in G2 phase?
During the G2 phase, extra protein is often synthesized, and the organelles multiply until there are enough for two cells. Other cell materials such as lipids for the membrane may also be produced. With all this activity, the cell often grows substantially during G2.
What happens in G1 phase?
Initially in G1 phase, the cell grows physically and increases the volume of both protein and organelles. In S phase, the cell copies its DNA to produce two sister chromatids and replicates its nucleosomes. Finally, G2 phase involves further cell growth and organisation of cellular contents.
What are 2 daughter cells?
Key Takeaways. Daughter cells are cells that are the result of a single dividing parent cell. Two daughter cells are the final result from the mitotic process while four cells are the final result from the meiotic process. For organisms that reproduce via sexual reproduction, daughter cells result from meiosis.
What is the DNA in G1 stage called?
Interphase
Interphase is composed of G1 phase (cell growth), followed by S phase (DNA synthesis), followed by G2 phase (cell growth).
How are two genes located on two different chromosomes?
Assume that two genes are located on two different chromosomes, and that the symbols G and H represent dominant alleles and g and h are recessive alleles of the two genes. What would be the phenotypic ratio of progeny produced after crossing GgHh X gghh if no epistasis occur?
How many homologous chromosomes are there in a cell?
If an organism has 8 homologous pairs of chromosomes (16 individual chromosomes), how many total chromatids would be present in a cell during metaphase of mitosis? They don’t have a Y chromosome to compensate for the recessive trait. They lack homologous chromosomes.
What does Mendel’s law of segregation mean for chromosomes?
Mendel’s law of segregation, as applied to the behavior of chromosomes in meiosis, means that: pairing of homologs will convert one allele into the other, leading to separation of the types.
How many chromatids are present at the start of meiosis?
During meiosis, how many chromatids are present in an individual cell at the start (metaphase I) and how many chromosomes are present in the gametes at the end of meiosis?