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topjm [15]
3 years ago
7

When do scientists believe life originated on Earth?

Biology
1 answer:
skad [1K]3 years ago
6 0
A. 3.7 billion years ago
You might be interested in
Ralph has type B blood and his wife Rachel has type A blood. They are very shocked to hear that their baby has type O blood, and
Cerrena [4.2K]

Answer:

1. The parents genotypes could have been BO and AO

2. wire-hair

Explanation:

There are four possible blood types which are type A, B, AB, O. blood group is the classification of blood based on the presence or the absence of inherited antigenic substances on the surface of the red blood cells. They have hereditary basis and also rely on a series of alternative genes sometimes used in solving dispute of parental heritage. With the four possible blood groups, there are six possible genotypes and these are:

Blood type               possible genotypes

Type A                         AA, AO

Type B                         BB, BO

Type AB                           AB

Type O                              OO

Thus, for parents with blood type B and A to give birth to a child with blood type O, it means their genotype could have been both BO and AO  for them to be able to produce a child with OO. a cross between these two could give rise to OO.

Question 2

Wire hair is dominant (S) to smooth (s), thus wire hair could be in the homozygous (SS) and heterozygous form (Ss) and the smooth hair can only be expressed in the homozygous recessive form (ss).

thus, in a cross between homozygous wire haired and smooth haired, we will have:

homozygous wire haired            homozygous smooth haired

P gen              SS                x               ss

F1 gen.                                Ss

phenotype:                     wire haired

8 0
3 years ago
A red shift in the spectrum of the light from an object indicates the object is moving ____ you.
Nataliya [291]
A red shift means that the object is moving away from you.
3 0
3 years ago
Which Enzyme has an optimal pH that is Acidic?
Vladimir79 [104]

Answer:

a. pepsin

Explanation:

it has a 1 to 2 level which is acidic because anything lower than 7 is acidic

5 0
3 years ago
Read 2 more answers
Which one of the following molecules can MOST easily pass through the plasma membrane unassisted?
Anton [14]

The molecule that can MOST easily pass through the plasma membrane without assistance is carbon dioxide (CO2). Diffusion is a type of passive transport that occurs when molecules move in favor of a concentration gradient.

During diffusion, molecules move high concentration to a region of low concentration.

Oxygen (O2) and carbon dioxide (CO2) are non-polar gasses that move across cell membranes by a process called simple diffusion.

Simple diffusion is a type of passive transport that does not require energy to move substances across cell membranes.

Learn more in:

brainly.com/question/1619908?referrer=searchResults

4 0
2 years ago
ATP is made of ribose, adenine, and _____.
olga_2 [115]
 (ATP) is comprised of an adenine ring, a ribose sugar, and three phosphate groups.
6 0
3 years ago
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