How many chromosomes are in a fruit fly's unfertilized egg? How many meiotic cell divisions are required to produce 124 spermatozoa? A mature human gamete should have how many chromosomes? What is the number of chromosomes in a human egg cell? A) 4 B) 23 C) 46 D) 48 ...
How many somatic cells are produced in mitosis?Cell Division:Mitosis is the process of somatic cells dividing. Cells must divide to replace old, dying cells, and for the organism to grow. Mitosis is a highly regulated process to ensure exact copying of the DNA....
The number of cells increases exponentially and can be expressed as 2n, wherenis the number of generations. If cells divide every 30 minutes, after 24 hours, 48 divisions would have taken place. If we apply the formula 2n, wherenis equal to 48, the single cell would give rise to 248or ...
Of course the division rate could be anything. If there were two divisions per day but one cell always died, we would expect three individuals from each single individual and Equation 1 would be N(t) = 3tN(0). So the division rate could be any number at all and the general equ...
While uniciliated cells can resorb their cilium to undergo mitosis, multiciliated cells apparently can never divide again. Nevertheless, many multiciliated epithelia in animals must grow or undergo renewal. The larval epidermis in a number of marine invertebrate larvae, such as those of annelids, ...
During mitosis, many proteins dissociate from chromatin and transcription shuts down. This may favour a silent PRE but challenge an active one. Several PcG and TrxG proteins remain bound to mitotic chromatin and may 'bookmark' silent and active states. Many PcG and TrxG target genes are dynami...
Key to the finding is something called chromosomal instability, found in about half of breast cancers and caused by errors that take place when cells improperly divide. Almost all cells in the body divide. This is how organisms grow and adapt. During that process, called mitosis, the original...
How many chromosomes are in each sperm? Where does meiosis occur? Explain reproductive mitotic and meiotic cell division What are the general purposes of mitosis and meiosis? How are the cells produced different in terms of chromosome number and general f...
Such a cell cycle is divided in four phases: (i) Initiation: stressed tumor cells undergo catastrophic mitosis or cell death. Surviving cells assume a tetraploid or polyploid transient state [1,11]; (ii) Auto-renovation: tetraploid cells start endocycling to produce mononuclear or multinuclear ...