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jasenka [17]
2 years ago
14

If a promoter is found within a nucleosome, how would it be possible to express that gene if needed?

Biology
1 answer:
SIZIF [17.4K]2 years ago
7 0

Answer:

A) special proteins would open the promoter while

Explanation:

A promoter is an area of DNA that can be bound to be proteins in order to initiate processes such as transcription. These sequences are usually a repetitive code.

---------I HOPE IT HELPS-----------

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Cerebrospinal fluid circulates within the ventricles of the brain and in the subarachnoid space. true or false
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3 0
3 years ago
A female fly that has miniature wings and sepia eyes is crossed with a male that has normal wings and is homozygous for red eyes
Eduardwww [97]

Answer and Explanation:

  • The gene that expresses the size of the wing is X-linked. The dominant allele expresses long wings, XM, while the recessive allele expresses miniature wings, Xm.  
  • The gene that expresses the color of the eyes is autosomal. The dominant allele expresses red color, S, and the recessive allele expresses sepia color, s.

A <em>female fly</em> that has <em>miniature wings and sepia eyes</em> (<em>XmXm ss</em>) is crossed with a <em>male</em> that has <em>normal wings and is homozygous for red eyes (XMY SS). </em>

The F1 are intercrossed to produce the F2.

1º Cross:

Parental) XmXm ss    x    XMY SS

Gametes) Xms   Xms     Xms   Xms  

                XMS   XMS    YS    YS

Punnet Square)    Xms           Xms            Xms             Xms

                XMS   XMXmSs    XMXmSs   XMXmSs    XMXmSs

                XMS   XMXmSs    XMXmSs   XMXmSs    XMXmSs

                YS      XmY Ss      XmY Ss       XmY Ss       XmY Ss

                YS      XmY Ss      XmY Ss       XmY Ss       XmY Ss

F1) 1/2 or 50% of the progeny are females and the other 1/2 or 50% are males

  100% of the females (1/2 or 50% of the progeny) are long-winged and  red-eyed

    100% of the males (1/2 or 50% of the progeny) are miniature.winged and red-eyed.

2º Cross:

Parental) XMXm Ss      x      XmY Ss

Gametes) XMS   XMs  XmS  Xms

                XmS   Xms  YS    Ys

Punnet Square)       XMS             XMs          XmS             Xms

                  XmS    XMXm SS  XMXm Ss   XmXm SS   XmXm Ss

                  Xms    XMXm Ss   XMXm ss   XmXm Ss    XmXm ss

                   YS      XMY SS     XMY Ss      XmY SS        XmY Ss

                   Ys       XMY Ss     XMY ss       XmY Ss        XmY ss

F2) 8/16=4/8=1/2 or 50% of the progeny are females and the other 1/2 or 50% are males

<u><em>Females (8/16)</em></u>:    

  • 3/8 of the females are long-winged and red-eyed, XMX- S-
  • 1/8 of the females are long-winged and sepia-eyed, XMX- ss
  • 3/8 of the females are miniature-winged and red-eyed, XmXm S-
  • 1/8 of the females are miniature-winged and sepia-eyed, XmXm ss

<u><em>Males (8/16)</em></u>:    

  • 3/8 of the males are long-winged and red-eyed, XMY S-
  • 1/8 of the males are long-winged and sepia-eyed, XMY ss
  • 3/8 of the males are miniature-winged and red-eyed, XmY S-
  • 1/8 of the males are miniature-winged and sepia-eyed, XmY ss  

Note: The symbol "-" means that in its place might be a recessive allele or a dominant allele. For example, <em>S-</em> means that it might be <em>SS</em> or <em>Ss</em>.  

4 0
3 years ago
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