Evolution — BIOLOGY STD 12 Science — Question

Haemophilia is a sex–inked inheritance condition in humans where a simple cut causes non–stop bleeding. Study the pedigree chart showing the inheritance of haemophilia in a family. Answer the questions that follow:

Give reasons which explain that haemophilia is:

1. Sex–linked, and,
2. Caused by ‘X’-linked gene.

Name any four autosome-linked recessive Mendelian disorders.

Answer the following questions:
List the differences between the embryos of dicot (pea) and monocot (grass family).

Many proteins are secreted in their inactive form. This is also true of many toxic proteins produced by micro organisms. Explain how the mechanism is useful for the organism producing the toxin?

Name the two most commonly employed hosts and the vectors for human gene cloning.

Differentiate between Dominance & Recessive

In a certain population, the frequency of three genotypes is as follows:

Genotypes:	BB	Bb	bb
Frequency:	22%	62%	16%

What is the likely frequency of B and b alleles?

What would happen when one grows a recombinant bacterium in a bioreactor but forget to add antibiotic to the medium in which the recombinant is growing?

What are chasmogamous flowers? Can cross- pollination occur in cleistogamous flowers? Give reason for your answer.

Give information about Cannabinoids.