Answer and Explanation:
cross: BbTt x bbTt
<u>Cross for B gene</u>
Parental ) Bb x bb
Gametes) B b b b
Punnet square) B b
b Bb bb
b Bb bb
F1) Genotypic proportion: 2/4=1/2 Bb : 2/4=1/2 bb
Genotypic ratio 1:1
Phenotypic proportion: 2/4=1/2 B- : 2/4=1/2 bb
Phenotypic ratio 1:1
<u>Cross for T gene</u>
Parental ) Tt x Tt
Gametes) T t T t
Punnet square) T t
T TT Tt
t Tt tt
F1) Genotypic proportion 1/4 TT
2/4 Tt
1/4 tt
Genotypic ratio 1 : 2 : 1
Phenotypic proportion: 3/4 T-
1/4 tt
Phenotypic ratio 3 : 1
Answer:
The correct answer is B high levels of lactose and high levels of cyclic AMP.
Explanation:
Lac operon contain 3 regulatory genes and 3 structural genes.In presence of lactose the repressor molecule that is encoded by Lac I gene cannot bound to the operator region.
Bacause the lactose interact with the repressor and change its conformation so that it cannot repress the expression of the structural genes of lac operon.
On the other hand cyclic AMP is a positive regulator of lac operon .The interaction of cyclic AMP with the promoter region of lac operon stimulates the binding of RNA polymerase in the promoter region to boost the expression of structural genes of lac operon such as Lac Z,Lac Y and Lac A.
Explanation:
In the majority of cases, the extra copy of chromosome 21 comes from the mother in the egg.
In a small percentage (less than 5%) of cases, the extra copy of chromosome 21 comes from the father through the sperm.
In the remaining cases, the error occurs after fertilization, as the embryo grows.
<u>Complete Question:</u>
Water pollution and air pollution in an area have been steadily increasing. What can students do to address these environmental hazards?
_______ to educate other students about the deteriorating environmental conditions and the steps needed to improve the area. Also, encourage other students to volunteer for workshops about _______.
1.
A. Pass Laws
B. Organize Seminars
C. Create a Tax collection program
2.
A. Recycling and waste disposal
B. Poaching
C. Deforestation
<u>Correct Option:</u>
<u>Organize seminars</u> to educate other students about the deteriorating environmental conditions and the steps needed to improve the area. Also, encourage other students to volunteer for workshops about <u>deforestation</u>.
<u>Option:</u> B and C respectively.
<u>Explanation:</u>
As the environmental conditions are deteriorating day by day, thus it is necessary to train to boost upcoming generation for preserving it in most appropriate manner. For such actions awareness is necessary which should be encouraged by some volunteers of non-profit organization, environment protecting units of state and central, etc to conduct seminar in colleges and schools for students to make them understand the need of plantation and disadvantages of deforestation. The pattern to aware them should be remarkable, in order to create huge impact on the new generations towards green land.
Answer:
D. It is non-living
Explanation:
If something is not made of cells, it cannot be alive.