Human Reproduction — BIOLOGY STD 12 Science — Question

Answer the following questions:
Write the Mendelian F₂ phenotypic ratio in a dihybrid cross. State the law that he proposed on the basis of this ratio. How is this law different from the law of segregation?

Describe in detail the multiple allelism by the help of inheritance of human blood group.

Draw a neat diagram of the female reproductive system and label the parts associated with the following.

1. Production of gamete.
2. Site of fertilisation.
3. Site of implantation.
4. Birth canal.

Explain the process of separation and isolation of DNA segments from gel electrophoresis technique.

If a desired gene is identified in an organism for some experiments, explain the process of the following:
i. Cutting this desired gene at specific location.
ii. Synthesis of multiple copies of this desired gene.

With a suitable diagram, describe the organisation of mammary gland.

Describe the ill-effects of alcohol on different parts of a body of an individual.

The graph given below shows the variation in the levels of ovarian hormones during various phases of menstrual cycle:

Specify the source of the hormone marked in the diagram.

In a biology class, teacher was telling the students that the structures/components and their functions in a watch can be compared with various levels of organisation we find in nature. Radhika was surprised and asked teacher to explain it. Teacher got impressed with Radhika's interest and explained that there is a systematic arrangement of smaller and simpler components into larger one in a hierarchy or pyramid having different levels where each level is formed of components of lower level and itself becomes part of higher level for achieving a common goal.
(i) What are the four levels of biological organisation found in nature?
(ii) What is the basic unit of ecological organisation?
(iii) Define community.
(iv) What values are shown by Radhika?

Trace the origin and evolution of Man.