Answer:
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Explanation:
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Anaphase is the fourth phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells. Before anaphase begins, the replicated chromosomes, called sister chromatids, are aligned at along the equator of the cell on the equatorial plane. The sister chromatids are pairs of identical copies of DNA joined at a point called the centromere.
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During anaphase, each pair of chromosomes is separated into two identical, independent chromosomes. The chromosomes are separated by a structure called the mitotic spindle. The mitotic spindle is made of many long proteins called microtubules, which are attached to a chromosome at one end and to the pole of a cell at the other end. The sister chromatids are separated simultaneously at their centromeres. The separated chromosomes are then pulled by the spindle to opposite poles of the cell.
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Anaphase ensures that each daughter cell receives an identical set of chromosomes, and it is followed by the fifth and final phase of mitosis, known as telophase.
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Answer: 50% of the offspring are predicted to have blue feathers.
Explanation:
<h3>Simple Dominance</h3>
I'm going to assume since the problem didn't say otherwise that we're working with simple dominance. This is usually the first kind of inheritance that we learn about in school.
For every gene, there are two alleles, a dominant allele (B), and a recessive allele (b). We represent these as a capital letter and a lower case letter. For this problem, let's use a 'B' for blue. There are three combinations that these can come in:
- BB - homozygous dominant
- Bb - heterozygous
- bb - homozygous recessive
If the alleles are the same, we say the organism is homozygous for the gene. If it has one of each, then the organism is heterozygous.
In simple dominance, if there's a dominant allele present (B), the organism will always show the dominant phenotype (in this case, blue feathers). So, the only offspring that can have white feathers are the ones with a bb genotype.
<h3>Punnett Square</h3>
A punnet square is a tool used by biologists to determine the probability of two organisms' offspring having certain genotypes. For this simple cross, where we have one gene with two alleles, we just need a 2x2 square. On either side of the square, we're going to put the two alleles of each parent. Then, we'll take each allele on top and add it to the boxes beneath it. Finally, take the alleles on the side and place them in the boxes to their right. I'll attach the completed square to my answer.
<h3>Interpreting the Results</h3>
Once the entire square is filled in, we'll see the following results:
2/4 offspring will have a heterozygous genotype (Bb) and therefore have blue feathers.
2/4 offspring will have a homozygous recessive genotype (bb) and have white feathers.
So, one-half, or 50%, of the parakeets' offspring will have blue feathers.
Solar System[a] is the gravitationallybound system of the Sun and the objects that orbit it, either directly or indirectly,[b] including the eight planets and five dwarf planets as defined by the International Astronomical Union (IAU). Of the objects that orbit the Sun directly, the largest eight are the planets,[c]with the remainder being smaller objects, such as dwarf planets and small Solar System bodies. Of the objects that orbit the Sun indirectly—the moons—two are larger than the smallest planet, Mercury.[d]
Solar System
The Sun and planets of the Solar System
(distances not to scale)
Age4.568 billion yearsLocation
Local Interstellar Cloud, Local Bubble,
Orion–Cygnus Arm, Milky Way
System mass1.0014 Solar massesNearest star
Proxima Centauri (4.25ly)
Alpha Centauri (4.37 ly)
Nearest knownplanetary systemProxima Centaurisystem (4.25 ly)Semi-major axis of outer known planet (Neptune)30.10 AU (4.503 billion km)Distance to Kuiper cliff50 AU
Populations
Stars1 (Sun)Known planets
8 (Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune)
Known dwarf planets
Possibly several hundred;[1]
five currently recognized by the IAU
(Ceres
Pluto
Haumea
Makemake
Eris)
Known natural satellites
525
(185 planetary[2]
347 minor planetary[3])
Known minor planets778,897 (as of 2018-06-21)[4]Known comets4,017 (as of 2018-06-21)[4]Identified rounded satellites19Invariable-to-galactic plane inclination60.19° (ecliptic)Distance to Galactic Center27,000 ± 1,000 lyOrbital speed220 km/sOrbital period225–250 MyrSpectral typeG2VFrost line≈5 AU[5]Distance to heliopause≈120 AUHill sphere radius≈1–3 ly
The Solar System formed 4.6 billion years agofrom the gravitational collapse of a giant interstellar molecular cloud. The vast majority of the system's mass is in the Sun, with the majority of the remaining mass contained in Jupiter. The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal. The four outer planets are giant planets, being substantially more massive than the terrestrials. The two largest, Jupiterand Saturn, are gas giants, being composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are ice giants, being composed mostly of substances with relatively high melting points compared with hydrogen and helium, called volatiles, such as water, ammonia and methane. All eight planets have almost circular orbits that lie within a nearly flat disc called the ecliptic.
Answer: earth because the moon doesn’t have gravity and the sun would burn you and who knows about pluto