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Fiesta28 [93]
3 years ago
7

Humans produce skin cells by mitosis and gametes by meiosis. The nuclei of skin cells produced by mitosis will have

Biology
2 answers:
bulgar [2K]3 years ago
5 0

Ans.

In humans and other higher organisms, two types of cell division, known as mitosis and meiosis takes place. Somatic cells or normal body cells of humans get divided by mitosis, while gametes are produced through meiosis.

During mitosis, a mother cell gets divided into two daughter cells and each daughter cell consists same number of chromosomes as in mother cell. In humans, 46 chromosomes are present in each cell. Thus, the skin cells, produced by mitotic division will have 46 chromosomes in their nuclei.

ale4655 [162]3 years ago
4 0

Answer:

The nuclei of the skin cells produced by mitosis will have identical genetic material as that of the parent cell.

It is because mitosis is a type of cell division in which a parent cell divides into two daughter cells, each having equal and identical chromosomes as that of the parent cell.

In addition, events like crossing over do not take place due to which no genetic variation is developed in the daughter cells.

The process of mitosis is mainly involved in the repair and growth of the body.

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Only a type of bacteriophage called the filamentous bacteriophage reproduces without killing the bacterial host cell.  The filamentous phages infect majorly gram negative bacteria.

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Cellular respiration converts the energy of fuel molecules to a form of energy that a cell can use to perform work. In an averag
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Two autosomal genes, J and K, are 60 map units apart. You perform the following testcross: J K / j k x j k / j k. At what freque
Dmitry [639]

Answer:

  • J K / j k = 20%
  • j k / j k = 20%
  • J k / j k = 30%
  • j K / j k = 30%                

Explanation:

To calculate the recombination frequency, we have to know that 1% of recombinations = 1 map unit = 1cm. And that the maximum recombination frequency is always 50%.

The map unit is the distance between the pair of genes for which every 100 meiotic products, one of them results in a recombinant one.

So, en the exposed example:

  • J and K are autosomal genes
  • J and K are separated by 60 M.U.
  • 60 M.U. means that there is 60% of recombination.

Cross)             J K / j k                    x                  j k / j k

Gametes) JK  Parental                                     jk, jk, jk, jk

                jk   Parental                                  

                Jk   Recombinant                          

                 jK   Recombinant

One map unit equals 1% of recombination frequency. This means that every 100 meiotic products, one of them is a recombinant one.

1 M.U. -------------- 1% recombination

60 M.U. ------------ 60% recombination

                              30% Jk  +  30% jK

100 M.U. - 60 M.U. = 40 M.U.

40M.U.--------------40 % Parental (Not recombinant)

                            20% JK   +   20% jk

Punnet Square)           JK       jk      Jk      jK

                          jk     JK/jk   jk/jk   Jk/jk   jK/jk

J K / j k = 20%

j k / j k = 20%

J k / j k = 30%

j K / j k = 30%                                

3 0
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Answer:

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