Answer:
The correct answer will be option-B.
Explanation:
Meiosis is a type of cell division which proceeds in two stages: meiosis I and meiosis II and result in the formation of four daughter cells.
The meiosis I is known as the reductional division as two daughter cells are formed with reduced ploidy level that is haploid cells from diploid cells. The cells formed contains chromosomes with two chromatids as the DNA amount gets doubled after the DNA synthesis.
Thus, Option-B is the correct answer.
Answer:
All progeny with heterozygous dominant genotype
Explanation:
Mendel crossed two pure breeding pea plants with respect to one genetic trait. He found that the F1 progeny obtained by crossing two pure breeding parent plants is always heterozygous dominant. The phenotype of the F1 progeny was always the phenotype of the dominant pure breeding parent plant.
For instance, purple flower color is a dominant trait over the white flower color in pea plants. When he crossed a pure breeding purple-flowered pea plant (PP) with a pure breeding white-flowered pea plant (pp), the F1 progeny was expressed the phenotype of the dominant parent and had purple flowers. The genotype of the F1 plants was Ww (heterozygous dominant).
Answer:
More than 7000 chemicals are present in tobacco smoke.
Explanation:
In these 7000 chemicals, 250 are harmful to the human body such as carbonmonoxide, ammonia and hydrogen cyanide etc. There are some chemicals that are found in tobacco smoke which causes cancer disease in human. About 69 chemicals out of 250 are present in tobacco smoke that causes cancer disease. So its consumption is dangerous for health.
B the origin of new matter in the steady state theory???
