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Phantasy [73]
3 years ago
7

According to the basic host–pathogen model of disease, if susceptible and infected individuals are the only types of individuals

in a population, then disease transmission is greatest when susceptible individuals are _______ percent of the population. [Hint: If the density remains the same, when is SI maximized?]
Biology
1 answer:
Anna11 [10]3 years ago
6 0

Answer:

50

Explanation:

Contact occurs from a reservoir to contaminated surfaces or objects, or to vectors such as mosquitoes, flies, mites, fleas, ticks, rodents or dogs, etc. Indirect contact infections spread when an infected person sneezes or coughs, sending infectious droplets into the air.

When 50% of the population are infected, the disease transmission is said to be greatest.

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In a hypothetical breed of dogs, coat color is controlled by two genes. There are six different coat colors in this breed: black
Andru [333]

The correct statements are C and F.  

There are two elementary types of pigments, which are responsible for the color of the coat, that is, phaeomelanin and eumelanin. Eumelanin is basically a black pigment and cells produced by it are responsible for a black dog coat color. However, there are genes that result in changes in eumelanin to produce brown, gray, or dusty pale brown coat color. The genes responsible for this change leads to the modifications in the creation of the eumelanin in the cells.  

Due to this reason, dusty pale brown and gray dogs are considered as dilutes. Eumelanin can also be witnessed in eyes and nose. On the basis of the genes in dogs, the nose can be brown, black, dusty pale brown, or gray. The other pigments, that is, phaeomelanin is red. Most of the dogs exhibit both phaeomelanin and eumelanin, and the manner in which these two pigments get amalgamated is controlled by agouti locus.  

The white color in dogs is not stimulated by any pigment, but by the cells that do not possess the capability to produce any kind of pigment. The entire animal can be affected in a different manner to albinos, or it can be restricted like the white coat patterns.  

The correct statements regarding the mode of inheritance of the coat color genes are:  

1) One of the genes modifies the expression of the other.  

2) One of the genes is autosomal, and the other is X-linked.  

8 0
3 years ago
Detritivores are also known as
son4ous [18]

Answer:

herbivores

Explanation:

because herbivores breakdown animal and plant material

4 0
3 years ago
Read 2 more answers
Choose all the answers that apply.
Vladimir [108]

Answer:

Paper, Aluminum, Glass, Copper, & Steel are all 100% recyclable.

Explanation:

3 0
3 years ago
Which of the following objects would best be used to understand how the human heart works?
Serjik [45]

The answer is C. Water Pump

4 0
3 years ago
Two fruit flies that are heterozygous for body color and eye color are crossed. Brown body color is dominant to black body color
trasher [3.6K]

Answer:

This question is incomplete, the complete question is:

Two fruit flies that are heterozygous for body color and eye color are crossed. Brown body color is dominant to black body color. Red eye color is dominant to brown eye color. Use the Punnett square to determine the ratio of offspring with: Brown body and red eyes : Brown body and brown eyes : Black body and red eyes : Black body and brown eyes :

The answer is:

Brown body and red eyes : 9

Brown body and brown eyes : 3 Black body and red eyes : 3 Black body and brown eyes : 1

Explanation:

This question is a typical dihybrid cross involving two different genes. One coding for body color and the other for eye color. The allele for Brown body color (B) is dominant to the allele for black body color (b) in the first gene while the allele for Red eye color (R) is dominant to the allele for brown eye color (r) in the second gene.

In a cross between two parents that are heterozygous for the two genes i.e. BbRr × BbRr, each parent will produce the following possible allelic combinations of gametes:

BbRr- BR, Br, bR, and br

Using these gametes in a punnet square (see attached image), 16 possible offsprings will be produced in the ratio 9:3:3:1 where the offsprings and their possible genotypes are;

Brown body and red eyes (B_R_): 9

Brown body and brown eyes (B_rr): 3

Black body and red eyes (bbR_): 3

Black body and brown eyes (bbrr): 1

8 0
3 years ago
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