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igor_vitrenko [27]
3 years ago
13

Replacement level fertility is

Biology
1 answer:
Rashid [163]3 years ago
4 0
The rate is roughly 2.1 children per woman for most countries, although it may modestly vary with mortality rates.
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3 years ago
Hormones are typically involved in maintaining _____, which is a given steady state for a particular factor (such as sugar or ca
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Answer:

Homeostasis

Explanation:

Homeostasis: It is referred to as the ability of a species to maintain a state of internal balance and changes in outside factors. When calcium levels decrease in the human body, the gland known as parathyroid releases hormones. If calcium levels increase, the thyroid gland helps out the calcium by lowering blood calcium levels and fixing calcium in the bones.

Glucose is known as the basic form of sugar. When glucose levels increase in the human body, the gland which is called Pancreas helps to releases a hormone known as insulin. If blood glucose levels decrease, the liver helps to converts glycogen which is present in the blood to glucose.

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3 years ago
Two independently segregating genes determine kernel color in wheat. Red color results from at least one dominant allele in both
Lera25 [3.4K]

Answer:

a) The expected phenotype of the F1 plants is 100% RrBb, red kernels.

b) The expected phenotypic classes in the F2 are: 9:3:3:1

   9/16 R-B-, 3/16 rrB-, 3/16 R-bb,  1/16 rrbb

   Proportions 9:6:1.

9/16 Red kernel (R-B-), 6/16 Brown kernel (rrB- + R-bb), 1/16 White kernel (rrbb)    

Explanation:

<u>Available data:</u>

  • red kernel: R-B-
  • brown kernel: R-bb or rrB-
  • white kernel: rrbb

1º Cross)  RRBB      x      rrbb

F1)             100% RrBb (red kernels)

2ºCross)   RrBb       x       RrBb

Gametes)  RB                   RB

                  Rb                   Rb

                  rB                    rB

                  rb                    rb

Punnet Square)      RB           Rb         rB         rb

                 RB      RRBB      RRBb     RrBB     RrBb

                 Rb      RRBb      RRbb     RrBB     Rrbb

                 rB       RrBB       RrBb      rrBB      rrBb

                 rb       RrBb       Rrbb       rrBb     rrbb

F2)  Phenotypic classes:

       <em>9/16 R-B-</em>

<em>        3/16 rrB-</em>

<em>        3/16 R-bb</em>

<em>        1/16 rrbb</em>

      Phenotypic proportions:

      <em>9/16 Red kernel (R-B-)</em>

<em>       6/16 Brown kernel (rrB- + R-bb)</em>

<em>       1/16 White kernel (rrbb)         </em>                      

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Based on newton's 3rd law the force pairs always act on
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