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Serggg [28]
2 years ago
13

The ___ Eon represents the past 544 million years of geologic time.

Biology
1 answer:
Tju [1.3M]2 years ago
5 0
The <span>Phranerozoic represents the past 544 million years of geologic time</span>
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In Drosophila, vestigial (partially formed) wings (vg) are recessive to normal long wings (vg+) and the gene for this trait is a
Marina CMI [18]

Answer/ Explanation:

a. The genotype of a homozygous white eyed long winged female would be Vg+Vg+XrXr. We denote the white allele as recessive (r) because the XY male only has one copy and yet has red eyes, so the red eye trait (R) must be dominant. A homozygous red eyed vestigial winged male would have be VgVgXRY. The possible gametes for the female are Vg+Xr only. For the male, the possible gametes are VgXR or VgY

The attached punnett square shows the results of the cross. The females will all be Vg+VgXRXr. The males will all be Vg+VgXRY (must inherit Y from father). That means they will all  have normal length wings, the males will have white eyes and the females will have red eyes.

b. The F2 flies arise from intercrossing the F1, so the cross will be Vg+VgXRXr x Vg+VgXRY. The possible gametes for the mother are: Vg+XR, Vg+Xr, VgXR or VgXr. The possible gametes for the father are Vg+Xr

, Vg+Y

, VgXr

, VgY

. The attached punnet square shows this cross. The ratio of the phenotypes will be 6:6:2:2, or 3:3:1:1 (long-winged red eye: long-winged white eye: vestigial wing red eye: vestigial wing white eye), genotypes shown in the attachment.

c. F1 cross back to the mother would be Vg+VgXRY x Vg+Vg+XrXr. The genotypes are shown in the attached punnet square. The offspring will all be long-winged with white eyes. The F1 to the father would be Vg+VgXRXr x VgVgXRY. The ratio would be 3:3:1:1 long-winged red eye: long-winged white eye: vestigial wing red eye: vestigial wing white eye

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7 0
3 years ago
A biologist studying a desert ecosystem observes that the population of a lizard species increases following particularly hot, d
Alona [7]

Answer:

B.

Explanation:

Same but different because lizards are very similar to snakes. Snake are just more vicious.

6 0
3 years ago
Instructions on how to control your cells are contained in what part of the DNA?
spayn [35]

Answer:

a

Explanation:

trust

4 0
2 years ago
Read 2 more answers
how does earth's rotation cause day and night A as earth rotates toward east, the sun appears to rise in the west and set in the
ioda
The Earth turns on its axis every day; it orbits the sun, just like all the other planets in our Solar System. You can cross out D and A, obviously. Which leaves us with answers B and C. Now, C says that the Earth turns clockwise, which is false; when viewed from space, they determined it turned counter-clockwise, which leaves us with B. Hope this helped
8 0
3 years ago
The figure shows a classic experiment that demonstrates the principle of osmosis. The left side of the U-tube is filled half-way
lawyer [7]
<h2>Answer:</h2>

According to the figure elaborated here, when the left side of the tube that is filled with 10% red sugar water, and the right side of the tube filled with distilled water pour into it, then the left side of tube rise in volume but remain as red colored. But the right side of the tube will fall in volume and the sugar water will be diluted.

Osmosis is actually the a process by which molecules of a solvent lead to move through a semipermeable membrane from a less concentrated solution into a more concentrated solution

3 0
3 years ago
Read 2 more answers
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