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4 years ago

In corn, a dihybrid for the recessives a and b is

1 answer:

7 0

In case of the genes that assort independently in a test cross, the phenotypic ratio is 1: 1: 1: 1. In the given case, the total number of phenotypes is 400, thus, every phenotype should be 100 each. Since that is not the case, it may be concluded that the genes are not assorting independently.

Thus, to determine the chi-square = (observed-expected)^2 / expected.

By putting the values, we get the values of chi-square as

AB = 4.84

Ab = 3.24

aB = 3.61

ab = 4.41

Thus, the chi-square value will be the addition of the individual values that comes out to be 16.1. Here there are three degrees of freedom (Number of classes-1). Observing at the P table, this puts the value of P < 0.005.

A large chi-square value suggests that independent assortment actually did not occur as the expected and the observed values were very distinct.

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Rufina [12.5K]

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3 years ago

Many diseases are caused by viruses or bacteria, which may be considered introduced species under certain circumstances (althoug

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3 years ago

Which process best describes the predictable development of plant structure in an area over time?

miss Akunina [59]

The best description of predictable development of plant structure in an area over time is primary succession. The correct option is a.

<h3>What is succession?</h3>

Changes in the physical environment and the population of the species cause succession. There are two types of succession: primary and secondary succession.

Nudation, invasion, competition and coaction, reaction, and stabilization are the five stages of ecological succession. Autogenic succession is derived by biotic factor in an ecosystem.

Thus, the correct option is a. primary succession.

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2 years ago

The development of herbicide resistance in populations of weeds over several generations is an example of___________.

bezimeni [28]

Answer: Evolution

Explanation:

Evolution can be defined as the change in the characteristics of the species over a period of time which basically relies on the process of the natural selection.

The characters that allows the survival of the organism is favored and is known as the survival of fittest which is a natural selection.

This is known as evolution in which the herbicide resistant plant is favored more and has developed over a period of time.

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3 years ago

Hyperthyroidism Hyperthyroidism decreases protein synthesis. slows heart rate. decreases oxygen consumption. causes cold intoler

Alex777 [14]

Hyperthyroidism decreases protein synthesis, increases heart rate, increases oxygen consumption, and increases protein catabolism.

<h3>What is Hyperthyroidism and its effect on the body?</h3>

Hyperthyroidism occurs when the thyroid gland produces too much of the hormone thyroxine.
Hyperthyroidism can accelerate body metabolism, causing unintentional weight loss and a rapid or irregular heart rate.
Hyperthyroidism is the catabolic state with increased energy expenditure, lipolysis, and protein turnover.
Increased protein turnover includes increased protein breakdown and reduced serum protein level.
Hyperthyroidism increases oxygen consumption to meet the body's requirements due to increased basal metabolic rate.

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2 years ago