The sequence of nitrogenous bases in a segment of a coding strand of DNA is
5' – AATGCTAGGCAC – 3'. Choose the option that shows the correct sequence of nitrogenous bases in the mRNA transcribed by the DNA.
1. Perform a cross between two sickle cell carriers. What ratio is obtained between carrier, disease free and diseased individuals in F1 progeny? Name the nitrogenous base substituted, in the haemoglobin molecule in this disease.
2. Explain the difference in inheritance pattern of flower colour in garden pea plant and snap-dragon plant with the help of monohybrid crosses.
OR,
Explain with the help of well-labelled diagrams how lac operon operates in E. coli :
1. In presence of an inducer.
2. In absence of an inducer.
Study the pedigree chart given below, showing the inheritance pattern of blood group in a family:
Answer the following questions:
(a) Give the possible genotypes of individual 1 and 2.
(b) Which antigen or antigens will be present on the plasma membranes of the R.B.Cs of individuals ‘5’ and ‘8’?
The current passing through the battery in the given circuit, is:
A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :
A full wave rectifier circuit with diodes (\(D_1\)) and (\(D_2\)) is shown in the figure. If input supply voltage \(V_{in} = 220 \sin(100 \pi t)\) volt, then at \(t = 15\) msec:
In human beings and animals, sex determination is usually conducted by hormonal differences, the combination of different chromosomes during reproduction. In human beings, males and females generally hold different gene variants and sex determination is hereditary. Sex differences involve the growth of a human's inner and outer sex organs and genitalia which plays a crucial role in Sex determination into masculinization and feminization that is by the growth of Sertoli cells in a male child and granulosa cells in a female child. As the zygote cell matures into adulthood definite things take place in sexual differentiation, that is the growth of different sex hormones, genes, reproductive glands, and long DNA molecules. The initial stages of sex differentiation in humans are somewhat similar to those of any other mammalian species' biological processes. In humans, males have a pair of XY chromosomes whereas females have a pair of XX chromosomes, and the Y chromosome of the male parent prompts testicular development like testis formation whereas X chromosomes of the male parent prompt ovarian development and form ovaries. Hence it is obvious that Father is the sex-determining factor.