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3 years ago

Before using any chemical in the lab, why should one first read the Material Safety Data Sheet (MSDS)?

Biology

1 answer:

STatiana [176]3 years ago

8 0

So you know what to do and to keep yourself and others protected.

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Derek lives in a forest area. His backyard has many deer mice that carry hantavirus. The soil is contaminated with the urine and

marta [7]

The answer is C, because of the propellant gas released when the contaminated soil is mixed and released of pressures.

4 0

3 years ago

In the "Little Albert" study, the fear-producing stimulus used as an unconditioned stimulus was the:_________a. White rat b. Fea

inn [45]

Answer:

c. Loud noise

Explanation:

3 0

3 years ago

In guinea pigs hair straightness or curliness is thought to be governed by a single pair of alleles showing incomplete dominance

Nimfa-mama [501]

Answer:

Frequency of allele S is p $= 0.4939$

Frequency of allele C is q $= 0.666$

The population is not in Hardy-Weinberg equilibrium

Explanation:

Given -

Number of individuals with straight hair $= 244$

Number of individuals with curly hair $= 444$

Number of individuals with Wavy hair $= 312$

Let "p" represents the frequency for allele for straight hair and "q" represents the frequency for allele for curly hair

$p^2$ represents the frequency of genotype "SS"

$p^{2} = \frac{244}{1000} \\= 0.244$

$q^2$ represents the frequency of genotype "CC"

$p^{2} = \frac{444}{1000} \\= 0.444$

$2pq$ represents the frequency of genotype "SC"

$2pq = \frac{312}{1000} \\= 0.312$

Frequency of allele S is p

$= \sqrt{0.244} \\= 0.4939$

Frequency of allele C is q

tex]= \sqrt{0.444} \\= 0.666[/tex]

For being in Hardy Weinberg's equation-

$p+q=1\\$

Substituting the values in above equation, we get -

$0.4939+0.666\neq 1$

hence, the population is not in Hardy-Weinberg equilibrium

4 0

4 years ago

hysical anthropologist Eva Hernandez visits a group of Yamomamo people in Venezuela and finds that only 3 individuals in a small

Naily [24]

Answer:

Genetic drift (sampling error)

Explanation:

According to the given information, the population under study has a small size and is more likely to be affected by genetic drift. Genetic drift refers to any chance event that leads to random changes in the allele frequencies of a population over time.

It may occur by sampling error that either makes the allele frequency 100% in the population or completely removes it from the population. Sampling error occurs quickly in the small population. The initial frequency of "blood type A" was 3/85= 0.035. Over the time period of 45 years, sampling error during gamete formation and random fertilization removed all the individuals with "blood type A" from the population and reduced its frequency to 0.

4 0

3 years ago

The term chemicals in this diagram represents

____ [38]

Answer:

C. hormone molecules

Explanation:

hormones are secreted in glands and are transported to the organs where they affect it and cause changes.

7 0

3 years ago