42 results found

Search Results for: chromatids

Sister chromatids

Definition noun, singular: sister chromatid The two identical strands joined by a common kinetochore as a result of a... Read More

Meiosis

What is Meiosis? A simple definition of meiosis would be is this: meiosis is the process of cell division that results in... Read More

Chromatids

Definition noun, singular: chromatid The two strands joined together by a single centromere, formed from the duplication of... Read More

Homologous chromosome

A homologous chromosome pertains to one of a pair of chromosomes with the same gene sequence, loci, chromosomal length, and... Read More

Bivalent

Bivalent Definition What is bivalent? In genetics, bivalent is used in describing homologous chromosomes (referred to as... Read More

Chromatin

Chromatin Definition What is chromatin in a cell? Chromatin is a complex of nucleic acids (e.g. DNA or RNA) and proteins... Read More

Meiosis and Alternation of Generations

Review of Mitosis: Cell Cycle The cell cycle contains the process in which cells are either dividing or in between... Read More

Sister chromatid

Definition noun, plural: sister chromatids Each of the two identical strands joined by a common kinetochore as a result of a... Read More

Non-sister chromatid

Definition noun, plural: non-sister chromatids Either of the two chromatids of any of the paired (homologous)... Read More

Chromatid

Definition noun, plural: chromatids Either one of the two strands joined together by a single centromere, formed from the... Read More

Anaphase II

Definition noun The third stage in meiosis II after prophase II, and highlights the separation of the sister chromatids of... Read More

Parthenogenesis

To reproduce, by definition, means to produce new offspring. The process is referred to as reproduction, which is one of the... Read More

Cohesion

Cohesion Definition What is cohesion? Cohesion, in science definition, refers to the state of cohering or sticking together... Read More

Genetic Information and Protein Synthesis

Genetic Code Genes are sequences of DNA nucleotides that carry and transmit the information specifying amino acid sequences... Read More

Metaphase I

Definition noun The second stage in the first meiotic division after prophase I, and highlights the alignment of paired... Read More

Law of Independent Assortment

Law of Independent Assortment Definition The Mendelian inheritance principles are derived from and named after the monk,... Read More

Pachytene

Definition noun The stage after zygotene and precedes diplotene, and is highlighted by homologous chromosomes shortening,... Read More

Anaphase I

Definition noun The third stage in the first meiotic division after prophase I, and highlights the separation of paired... Read More

Meiotic spindle

Definition noun The collective term for all the spindle fibers that form during meiosis Supplement The spindle apparatus is... Read More

Law of Segregation

Mendel’s Laws of Inheritance The father of genetics, Gregor Mendel, reported his findings in 1860 that were initially... Read More

Telophase I

Definition noun The stage in the first meiotic division after anaphase I, and identified by the complete movement and... Read More

Chromosome

Chromosomes Definition Chromosomes are the thread-like structure present in the nucleus of plant and animal cells.... Read More

Telophase II

Definition noun The stage in meiosis II after anaphase II, and identified by the complete movement and separation of the... Read More

Mitosis

Mitosis Definition What is mitosis? In biology, mitosis refers to the cellular process where a single cell divides... Read More

Diplotene

Definition noun The late stage of prophase I of meiosis I in which homologous chromosome pairs begin to separate and move... Read More

Leptotene

Definition noun The first sub-stage of prophase I of meiosis I in which the chromosomes at this stage are characteristically... Read More

Nullisomy

Definition noun (genetics) A type of aneuploidy characterized by the loss of a pair of homologous... Read More

Kinetochore

Definition noun, plural: kinetochores A protein complex that assembles at the centromeric region of the chromosome during... Read More

Cells know when to separate at mitosis

How do cells know when to separate during mitosis? A molecule called BubR1 was found to regulate the timing of the division... Read More

Plant Cells vs. Animal Cells

Plant Cells Most cells are not visible with the naked eye. However, with microscopes of various types, plant cells can be... Read More

Prometaphase

Definition noun The phase of mitosis between prophase and metaphase wherein the nuclear envelope breaks down and form... Read More

Chromosomal crossover

Chromosomal Crossover Definition noun A process occurring during meiosis wherein homologous chromosomes pair up and... Read More

Meiosis II

Definition The second of the two consecutive divisions of the nucleus of eukaryotic cell during meiosis, and composed of the... Read More

Meiosis I

Definition The first of the two consecutive divisions of the nucleus of eukaryotic cell during meiosis, and composed of the... Read More

Paracentric inversion

Definition noun, plural: paracentric inversions (genetics) An inversion of a segment of chromosome in which the centromere... Read More

Chiasma

ChiasmaThe point of contact between paired chromatids during meiosis, resulting in a cross-shaped configuration and... Read More

Polytene chromosome

polytene chromosome (Science: cell biology) giant chromosomes produced by the successive replication of homologous pairs of... Read More

Centromere

Definition noun, plural: centromeres The dense, constricted region containing highly-specialized repetitive DNA sequence,... Read More

Metakinesis

metakinesis Metakinesia moving apart; the separation of the two chromatids of each chromosome and their movement to opposite... Read More

Hermaphrodite

We all know that typically living organisms are divided into two main categories of sex-based on their biological structure.... Read More