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svp [43]
3 years ago
12

Greg has several siblings that all look very different from one another. However, he can see different traits from his mother an

d father in each of them.
What contributed to these differences between his siblings?

A. Both prophase 1 and prophase 2 occurred during the formation of his parents' sex cells.
B. Independent assortment occurred during the formation of his parents' sex cells.
C. Independent assortment occurred during fertilization of each egg cell.
D. In mitosis during growth, crossing over caused each child to develop differently.
Biology
2 answers:
viktelen [127]3 years ago
8 0

Answer:A

I guess? May be wrong

Good Luck!!!

Serjik [45]3 years ago
6 0

Answer:

B

Explanation:

Independent assortment and segregation of chromosomes during meiosis resulted in recombinant chromatids forming that resulted in gametes formed being vastly different from the original sequence of the chromosomes (gene locus remains constant but gene sequence changed) resulting in resultant zygote to have different alleles which resulted in both siblings being different.

However, both siblings looks like their parents as zygote formed are a combination of 1 unit of chromosomes from each parent. Hence, offsprings will have traits from each parent.

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Why is the pulmonary circulation reduced in the unborn human fetus
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Why is the pulmonary circulation reduced in the human fetus? Pulmonary circulation is reduced in the human fetus because the baby gets its oxygen from its mother and does not breath on its own.

5 0
3 years ago
at which location does gravity play a role in moving tectonic plates? at the edge of the plates. in the core. in the mantle. in
yulyashka [42]

Answer:

B. At the edge of the plates

Explanation:

<u>Gravity </u>is the principal <u>driving force </u>of <u>plate tectonics </u>(second one is convection<u>)</u>. It causes different density plates to move on the Earth's surface. However, when a <u>denser plate coincides the less denser plate, the high density plate subducts</u> below the <u>lesser density plate</u>. The process, therefore, is called <u>subduction</u>. During this collision of plates, <u>shearing resistance increases</u> and all <u>pressures come at the edge of the plate</u>. The process continues and the lithosphere drags the rest of the plate. The portion of plate below the less denser plate then reaches the mantle. Here, the edge of plate is destroyed due to high temperature of mantle as well as pressure.

7 0
3 years ago
A particular species of bacteria has a "a generation time" of 20 minutes. That is, every 20 minutes a single bacterium completes
timofeeve [1]

Answer:

Number of bacteria cells = 2621440 cells

Explanation:

The generation time of a bacteria specie is the time it takes for a population of bacteria to double in number. The generation time for most common bacteria is quite short, about 20 minutes to 1 hour.

Bacteria reproduce asexually by binary fission, in which the parent cell divides into two to produce two identical daughter cells.

In the given question, the generation time of the bacterial species is 20 minutes.

The time that have passed from between the time the sandwich was packed at 6:00 am to lunch time by 12:00 pm is 6 hours.

Using the given formula in the hint: number of cells = 2^(ab) × C

Where a = number of times per hour the bacteria reproduces; b = number of hours; C = number of bacteria at the start

a = 60 minutes/ 20 minutes = 3; b = 6; C = 10

Number of cells = 2^(3 × 6) × 10

Number of cells = 2621440 cells

5 0
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To experience the different rocks and minerals
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How do we combine forces?
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Answer:

You first kill/dominate the other and then you dictate whatever is left.....

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