Question

i) What is the cause of expression of haemophilia disease in women

at homozygous condition?

ii) What is the ratio of Ammonia, Hydrogen and Methane taken in

Urey Miller experiment?

iii) Name the molecule which condenses and coils to form

chromosome.

iv) Who proposed the term 'Gene'?

v) Name the book on evolution by Lamarck




State True or False :
i) The sex chromosome pair in the ovum is actually responsible for

sex determination in human.

ii) Duck billed Platypus is an egg laying mammal.​

Answer 1

i)Hemophilia is caused by a problem in one of the genes that tells the body to make the clotting factors needed to form a blood clot. These genes are located on the X chromosome. All males have one X and one Y chromosome (XY) and all females have two X chromosomes (XX).

ii)2:1:2

The ratio of methane, ammonia and hydrogen was 2:1:2. So, the correct answer is '2:1:2'.

iii)After DNA replicates and the cell is about to divide, the DNA condenses and coils into the X-shaped form of a chromosome. Each chromosome actually consists of two sister chromatids, which are joined together at a centromere

iv)Danish botanist Wilhelm Johannsen coined the word gene to describe the Mendelian units of heredity. He also made the distinction between the outward appearance of an individual (phenotype) and its genetic traits (genotype).

v)As Lamarck lectured his students in 1803, after ten years of research on invertebrates: ... Of these, Philosophie zoologique, published in 1809, most clearly states Lamarck's theories of evolution. The first volume of Histoire naturelle des Animaux sans vertèbres was published in 1815, the second in 1822.