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Reil [10]
2 years ago
6

You want to determine whether short wings in fruit flies are the result of a dominant or recessive mutation. You cross a short-w

inged fly stock with a long-winged fly stock (which is considered to be wild type or / ). The progeny have a 1:1 ratio of short to long wings. You then allow the F1 short-winged flies to mate. The F2 progeny have a phenotypic ratio of 3:1 short to long wings. Short wings are likely the result of:
Biology
1 answer:
Natalka [10]2 years ago
4 0

Answer:

a dominant mutation

Explanation:

A monohybrid testcross is a cross-breeding experiment used to determine if an individual exhibiting a dominant phenotype is homo-zygous dominant or heterozygous for a particular phenotypic trait (in this case, wing length). In a monohybrid testcross, a 1:1 phenotypic ratio shows that the dominant parental phenotype was a heterozygote for a single gene that has complete dominance. Moreover, a 3:1 ratio in the F2 is expected of a cross between heterozygous F1 individuals, which means that 75% of individuals with short wings have the dominant allele that masks the expression of the long-wing trait (i.e. the recessive allele).

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What is a Lytic infection and What is a lysogenic infection?
expeople1 [14]

Answer:

Infection of a bacterium by a bacteriophage with subsequent production of more phage particles and lysis, or dissolution, of the cell. The viruses responsible are commonly called virulent phages. Lytic infection is one of the two major bacteriophage–bacterium relationships.

Lysogeny, or the lysogenic cycle, is one of two cycles of viral reproduction. Lysogeny is characterized by integration of the bacteriophage nucleic acid into the host bacterium's genome or formation of a circular replicon in the bacterial cytoplasm.

Explanation: hope this helps!

5 0
3 years ago
What is "set point theory"? are toxins involved? describe how body size and homeostasis are related?
guajiro [1.7K]
<span>Answer: Set point theory suggests that our body has a particular range of weight that it is comfortable in, usually about 10% of a body’s weight. That means, if you weight 175, you have about an 18 pound range; if you weigh 325, you have about a 33 pound range. Most people lose and gain within this set point on a pretty regular basis. They may put on a little weight in the winter and lose it in the spring. Or get busy and drop a little weight. Or gain a little when stressed. Or lose a little during an illness. Or whatever. Movement within this range is normal. However, movement outside of that range is not. In fact the body seeks homeostasis – that is the body seeks to stay within that range. To move outside of that range something must go on, something must happen to the body.</span>
4 0
3 years ago
Which is easier to identify: prophase, metaphase, anaphase, or telophase?
Romashka [77]

Answer:

metaphase

Explanation:

The easiest stage of mitosis to identify under the microscope is the metaphase stage.

<em>The stage is characterized by the alignment of chromosomes at the center (the equator) of the cell forming what is known as the 'metaphase plate'. The metaphase plate can easily be seen at a glance under a focused microscope. Other stages of mitosis are continuous and will take a bit of effort to pinpoint a particular stage from the transition stage. </em>

7 0
3 years ago
Imagine animal cells had chloroplasts. Chloroplasts allow plant cells to perform photosynthesis. How do you think
Helen [10]

Answer:

it would probably mean that we wouldn't have to eat, or not as much anyway, we aren't outside 24/7 and unlike plants. we move around, so during winter we can't just go dormant nor can we just stand outside. To sum this up, we would probably only have to eat less

Explanation:

3 0
3 years ago
How do plants get the nitrogen they need?
ololo11 [35]

Correct answer: D) From bacteria living in their roots

Nitrogen is an essential plant nutrients, but it is metabolically unavailable to higher plants and animals. It is available to some species of microorganism by biological nitrogen fixation in which nitrogen is converted to ammonia with the help of enzyme dinitrogenase.

The process of breaking apart the two atoms in a nitrogen molecule is called nitrogen fixation. Plant obtain the nitrogen they need from the soil which is already fixed by the bacteria and archae.

Example: <em>Azobacter</em><em>,</em> Nostac    

5 0
3 years ago
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