Mitosis
Meiosis
Crossovers
Dominant vs Recessive alleles
10
The number of phases in Mitosis?
four
10
When one diploid nucleus divides by meiosis, how many haploid nuclei are formed?
4
10
crossover is the process of swapping sections of _______ between___________ near the beginning of meiosis.
crossover is the process of swapping sections of DNA between non-sister chromatids near the beginning of meiosis.
1. DNA
2. Non-sister chromatids
10
What is a recessive allele?
A recessive allele is an allele that is masked when a dominant allele is present.
20
What is the purpose of Mitosis?
The purpose of mitosis is to make more diploid cells, replacement of damaged cells or growth.
20
What is the stage of meiosis where the random assortment of homologous chromosomes takes place?
Metaphase I
20
The recombination or new combination of genes is possible only due to exchange of genetic material between_________.
Homologous pairs
30
what is this phase called?
Metaphase
30
What is the difference between meiosis 1 and meiosis 2?
In meiosis I, homologous chromosomes separate, while in meiosis II, sister chromatids separate. Meiosis II produces 4 haploid daughter cells, whereas meiosis I produces 2 diploid daughter cells.
30
The non-sister chromatids in which exchange of segments have occurred are called recombination or cross-overs while the other chromatids in which crossing over has not taken place are known as_________
Parental chromatids or non crossovers
40
A package of histones with DNA wrapped around them forms a spherical structure and is called:
Nucleosomes
40
What causes down syndrome?
Down syndrome is caused when abnormal cell division results in an extra full or partial copy of chromosome 21.
40
What is the evolutionary purpose of cells that undergo crossing over?
Crossing over is a process that happens between homologous chromosomes in order to increase genetic diversity. During crossing over, part of one chromosome is exchanged with another. The result is a hybrid chromosome with a unique pattern of genetic material. which will help cells participate in survival of the fittest and evolution.