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Fofino [41]
1 year ago
7

Which factors can prevent permanent fixation of an allele (i.e. maintain genetic diversity)? Hint: You're going to have to try d

ifferent values than just those presented in the exercise--try to keep both alleles present! a. Gene Flow b. Genetic Drift c. Natural Selection d. Mutation
Biology
1 answer:
aleksandr82 [10.1K]1 year ago
3 0

Answer:

Option D

Explanation:

Mutations are changes that occur in the DNA sequences as a result of environmental factors like exposure to some certain chemicals or radiation that can be passed down to the offspring and this increases genetic variations which can prevent permanent fixation of an allele.

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You are conducting a case control study to determine if an association exists between melanoma and indoor tanning. From a statew
Aleksandr-060686 [28]

Answer:

a. Odds ratio = 1.58

b.  Inasmuch the odds ratio is greater than 1, this means that higher odds of melanoma exist in people exposed to indoor tanning, than in those not exposed to indoor tanning

Explanation:

For case  study                                                  

Let 'a'  represent the total population of people with melanomia = 696                                                      

Let 'b' represent the total number of people with melanomia exposed to indoor tanning  =  1107 – 696 = 411 people

For  control study

Let 'c' represent the total population = 1500

Let 'd' represent the total number of people not exposed to indoor tanning = 1500 - (0.428 * 1500)

                                                          =  1500 - 723

Total number of people not exposed to indoor tanning   = 777 people

                                                       

a. Odds ratio = (a/b) / (d/c) = (696/411) / (777/723)

                                                = 1.69 / 1.07 = 1.58

b. Inasmuch the odds ratio is greater than 1, this means that higher odds of melanoma exist in people exposed to indoor tanning, than in those not exposed to indoor tanning.

7 0
2 years ago
Which of these terms apply to human digestive systems: intracellular digestion, extracellular digestion, blind gut, complete gut
artcher [175]

The right answers are complete gut and one-way gut.


Food is ingested by the mouth, where it is chewed and then thrown into the esophagus during swallowing.

After, there is food in the stomach

Then there is digestive absorption of nutrients in the small intestine

After that, Waste disposal and reabsorption of water in the colon (large intestine)

And finally, stool passes through the rectum (anus), where it is stored before defecation, induced by a reflex mechanism.

7 0
2 years ago
Read 2 more answers
A lab technician provides you with a bacterial pellet labeled "G3". When you observe the pellet under UV light, there is little
umka21 [38]

Answer: The two possible explanation for the outcome are as follows:

Explanation:

1. The bacterial DNA in the pellet was not completely isolated properly, therefore, no fluorescence was observed in the pellet under the exposure of UV radiation.

2. After 3 hours of induction with the IPTG and labeling with the G3. The IPGT might not be able to bound to the bacterial DNA that could show response of fluorescence in the ultraviolet light.

4 0
2 years ago
Biomechanists typically work in all of the following settings except
swat32

Answer:

a nutrition facility that targets women

Explanation:

It should be noted that biomechanics is known to be the study of movement, most especially in biological system. And the person involved in this study is being referred to as a biomechanists.

It should be understood that the major role of the biomechanist is to make use of the knowledge or principles acquired, that is, the principles of  physical mechanics in combination with those of biology , in order to understand how people move, how they can move more effectively, why they sometimes get injured and how to reduce the incidence of injury.

in this case, they are not expected in a nutrition facility that targets women.

5 0
1 year ago
In cats, the Dense pigment gene, D/d, codes for melanophilin, a protein involved in the transportation and deposition of pigment
SVETLANKA909090 [29]

Answer:

a. M_D_ : 9/16 Black furred individuals

b. M__dd : 3/16 gray furred individuals (1/16 MMdd + 2/16 Mmdd)

c. mmD_ : 3/16 Brow-furred individuals (1/16 mmDD + 2/16 mmDd)

d. mmdd: 1/16 gray furred individuals.

Explanation:

Available data:

  • Dense pigment gene, D, codes for melanophilin.
  • D allele dominant over d.
  • Gene M/m is responsible for the production of the pigment
  • M is dominant over m
  • If D is present, M/m is expressed
  • If dd is present, M/m is not expressed  
  • DDMM, DdMM, DDMm, DdMm --->Black fur
  • DDmm, Ddmm ---> Brown fur
  • ddMM, ddMm -----> Light gray fur

Cross: between two dihybrids

Parental)         DdMm     x     DdMm

Phenotype) Black-furred      Black-furred

Gametes) DM, Dm, dM, dm   DM, Dm, dM, dm

Punnet Square)    DM        Dm         dM          dm

             DM       DDMM    DDMm   DdMM   DdMm

             Dm       DDMm    DDmm   DdMm   Ddmm

             dM        DdMM    DdMm    ddMM   ddMm

             dm        DdMm    Ddmm    ddMm   ddmm

F1) 9/16 Black-furred individuals, D-M- (1/16 DDMM + 2/16 DDMm + 2/16    

                                                                 DdMM + 4/16 DdMm)

    3/16 Brown-furred individuals, D-mm ( 1/16 DDmm + 2/16 Ddmm)

    4/16 Gray-furred individuals, dd-- ( 1/16ddMM + 1/16 ddmm + 2/16 ddMm)

   

   

7 0
2 years ago
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