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Aliun [14]
3 years ago
15

Glaucoma is a leading cause of blindness. Studies have linked a common form of glaucoma to three genes and more than 20 genetic

loci. Which best describes glaucoma?
a) a recessive trait that requires multiple recessive alleles to be expressed

b) a polygenic trait that is influenced by the number of alleles present

c) a codominant trait that is expressed more often when more dominant alleles are present

d)a dominant trait that depends on the presence of only one of many dominant alleles
Biology
2 answers:
NeX [460]3 years ago
8 0

Answer: The correct answer is -

d) a dominant trait that depends on the presence of only one of many dominant alleles.

Glaucoma is an autosomal dominant trait, meaning that presence of single copy of the defective gene is enough to cause the disease.

It corresponds to a group of diseases, which cause damage in the optic nerve, leading to loss of vision and if not treated, it ultimately leads to blindness.

Thus, option D) is the right answer.

Alik [6]3 years ago
7 0

Glaucoma is a leading cause of blindness. Studies have linked a common form of glaucoma to three genes and more than 20 genetic loci. Glaucoma is best described by the polygenic trait that is influenced by the number of alleles present.

Further Explanation:

Glaucoma is a very complex disease in which the damage to the optic nerve occurs. This condition causes loss in vision. The very widespread kind of glaucoma is primary open-angle glaucoma. It has no direct symptoms or signs or symptoms but gradually can cause loss in vision.

Alleles are defined as the different type of the same gene. DNA is composed of different nucleotides and consists of genetic information in the form of genes. Alleles can influence the function of the gene as they determine particular character such as skin color and eye color that can be inherited from parents to the offspring through sexual reproduction.  

There are mainly three types of genes that are mainly associated with a standard form of glaucoma. So, it should be related to the polygenic trait, and that is, it comprises more than one gene. The polygenic traits are affected by the number of alleles. In this circumstance, there are more than twenty genetic loci present, which signify that there must be a larger quantity of alleles for all the loci.

Learn more:

  1. Learn more about graffain follicle <u>brainly.com/question/4189307 </u>
  2. Learn more about human sperm and egg cells <u>brainly.com/question/1626319 </u>
  3. Learn more about female reproductive tract <u>brainly.com/question/9813796 </u>

Answer Details:

Grade: High School  

Subject: Biology

Topic: Glaucoma disease

Keywords:

Gene, polygenic trait, loci, sexual reproduction, allele, color eye, skin color, genetic reproduction, glaucoma, DNA, genetic information, genetic loci.

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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
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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>.  

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