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Montano1993 [528]
3 years ago
7

The gene D controls wing shape in flies and has two alleles: D is wild-type and dominant, and d is recessive and causes flies to

have downward pointed wings. The gene E controls eye development and also has two alleles: E is wild-type and dominant, and e is recessive and causes the flies to have small eyes. The two genes are located on the same chromosome. A true-breeding fly with wild-type wings and small eyes was crossed with a true-breeding fly with downward wings and wild-type eyes. All of the F1 progeny had a wild-type phenotype. The recombination frequency between the two genes is 20%. If an F1 individual was test crossed to a ddee fly, what percentage of the progeny would you expect to have the WT phenotype?
Biology
1 answer:
borishaifa [10]3 years ago
8 0

Answer:

10% of progeny would have wild type phenotype

Explanation:

True breeding fly with wild type wings and small eyes: De/De

True breeding fly with downward wings and wild type eyes: dE/dE

Cross between them :  De/De X dE/dE = De/dE ( F1 )

Recombination frequency = 20%

Next cross, De/dE X de/de =

De/de = parental = 40%

dE/de = parental = 40%

DE/de = recombinant = 10%

de/de = recombinant = 10%

The third genotype i.e. one of the recombinant genotypes will have the wild type makeup ( DE/de ) hence 10% of flies would have wild type phenotype.

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4 0
2 years ago
The first energy-generating steps in glycolysis begin when glyceraldehyde 3-phosphate undergoes an energetically favorable react
KonstantinChe [14]

Answer:

The answer is option B.

Explanation:

It is stated that "the enzyme glyceraldehyde 3-phosphate dehydrogenase to form 1,3-bisphosphoglycerate" which indicates that the energy from the broken bonds of the glyceraldehyde 3-phosphate provides energy for the reaction to take place.

So the correct answer is option B.

I hope this helps.

5 0
3 years ago
explain why the following statements are false. a. feedback inhibition is defined as a mechanism of down-regulating enzyme activ
lyudmila [28]

False. Feedback inhibition occurs when an enzyme acting early in a pathway is inhibited by the accumulation of a product late in the pathway

<h3>What is inhibition ?</h3>

Inhibition is the conscious or unconscious restriction or restraint of a process or behavior, especially of urges or wants. The ability to inhibit oneself from acting on some impulses, such as the desire to hit someone in a fit of rage, and to delay the satisfaction of pleasurable activities allows one to perform vital social functions. When two desires are perceived that are in conflict, conscious suppression often occurs in daily life (e.g., the desire to eat a rich dessert versus the desire to lose weight).

According to psychoanalytic theory, inhibition serves as a mediator between the id and the superego, or conscience, and is largely unconscious (primitive desires). The socially imposed inhibitions known as taboos, such as those prohibiting incest or murder, are elevated to the level of moral prohibition.

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1 year ago
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Question: Which pituitary hormone causes liver cells to release somatomedins that increase the rate of uptake of amino acids by cells such as skeletal muscle fibers?

follicle-stimulating hormone

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growth hormone

Explanation:

Somatomedins are growth factors. The growth hormone makes the cells such as liver cells, skeletal muscles, bones, etc. to secrete the somatomedins. The somatomedins from the liver enter the bloodstream to reach the target cells. The somatomedins make the skeletal muscles, bones, etc. to absorb amino acids into the cells so as to facilitate protein synthesis. This growth factor also downregulates the breakdown of proteins. This is how growth hormone triggers the growth of muscles and soft tissues.

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3 years ago
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