OUT REFERENCES MALINGS 8 Assignment(1) Compatibility Model-Word REVIEW VIEW Chap

Question

OUT REFERENCES MALINGS 8 Assignment(1) Compatibility Model-Word REVIEW VIEW Chapter AaBbooD AaBboonoo AaBbc AaBbool A 1 Normal TNo spac. Heading 1 Styles Paragraph Chapter 8 Assignment 1. A mule is the offspring of a horse and a donkey. A donkey sperm contains 31 chromosomes and a horse egg has 32 chromosomes so the zygote contains a total of 63 chromosomes. The zygote develops normally. The combined set of chromosomes is not a problem in mitosis, and the mule combines some of the best characteristics of horses and donkeys. However, a mule is sterile; meiosis cannot occur normally in its testes or ovaries. Explain why mitosis is normal in cells containing both horse and donkey chromosomes but the mixed set of chromosomes interferes with meiosis.

Explanation / Answer

A mule is cross between a female horse and a male donkey.   The reason mules are sterile has to do with synapsis of the chromosomes during meiosis. Mitosis works because there is no synapsis in mitosis, so the pairing up of chromosomes is not problem.   Synapsis is a problem in meiosis because there is an odd number of chromosomes that have to pair up.

Mitosis:

a. Number of chromosomal duplication = 1

b. Number of cell division                       = 1

c. Number of daughter cells produced   = 2

d. Number of chromosomes in daughter cells = 2n

e. How chromosomes lineup during metaphase = 2n = 63 or singly

f. Genetic relationship of daughter cells to parent cells = Genetically identical

g, functtion performed in human body = repair cell damage, it is occur only in somatic cells

Meiosis:

a. Number of chromosomal duplication = 1

b. Number of cell division                       = 2

c. Number of daughter cells produced   = 4

d. Number of chromosomes in daughter cells = n Haploid

e. How chromosomes line up during metaphase = Meiosis I ---> Tetrad , Meiosis II -----> singly

f. Genetic relationship of daughter cells to parent cells = Genetically unique

g. Function of humanbody = it is occur in sex cells,

3. Cell Cycle :

G1 gap phase : In these phase cellular monitoring take place, cellular enivornment and the cell size to ensure that the condition are appropriate to support DNA replication.

S phase : It also known as synthesis , when DNA packaged into chromosomes is replicated and enter into G2 phase

G2 phase : it is second subphase of interphase in the cell cycle directly preceding mitosis.

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