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zhannawk [14.2K]
3 years ago
11

1. What is the difference between external and internal fertilization? *

Biology
1 answer:
Andru [333]3 years ago
7 0
Internal fertilization is the process when the syngamy (union of male and female gamete) occurs inside the female body after insemination using copulation. In contrast, External fertilization is the syngamy outside the female body, that is in the outer environment especially in water bodies.
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What is the average atomic mass of a sample that has two isotopes, one with a mass of 21 amu at 62% abundance and another with a
motikmotik

Answer:

Average atomic mass = 21.38 amu.

Explanation:

Given data:

Mass of first isotope = 21 amu

Abundance of first isotope = 62%

Mass of second isotope = 22 amu

Abundance of second isotope = 38%

Average atomic mass = ?

Solution:

Average atomic mass  = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass  = (62×21)+(38×22) /100

Average atomic mass =  1302 +836 / 100

Average atomic mass = 2138 / 100

Average atomic mass = 21.38 amu.

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andriy [413]
1. Anaphase. In <span>Anaphase the sister chromatids separate from each other to the opposite sides of the cells.

2. </span>Chromosomes would not separate into two nuclei. <span>Mitosis is a process cell division, where one cell divides into two identical cells.
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5. </span><span>A species has to adjust rapidly to a changing environment. To adjust to the environment, crossing over is necessary, and it does not occur in mitosis, but meiosis.

6. 50 percent. 
Parents:          Yy      x     yy
Offspring:    Yy    Yy    yy   yy
50 % is Yy  and 50% is yy.

7. </span><span>One parent had white eyes and the other was heterozygous for eye color. The ratio in the offspring is 50-50. The only possibility is the following:
Parents:       Rr     x     rr
Offspring   Rr    Rr   Rr   Rr

8. </span><span>Their fur will be a mixture of red and white hairs. The offspring will be heterozygous. They will have alleles for both red and white hairs and both will be expressed.
</span>
9. Not enough information.

10. <span>Both of the parents' genotype must have been Pp. The genotype of the white plant is pp since it is recessive:
Parents:        Pp     x     Pp
Offspring:   PP   Pp   Pp   pp
One of the four is white.</span>

4 0
3 years ago
What structure/material acts as "instructions" for the cell?
sattari [20]

Answer:-DNA.But I am not sure

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