Human Reproduction — BIOLOGY STD 12 Science — Question

What is semen?

Mention the different ways in which people are made aware of the significance of reproductive health and a reproductively healthy society.

Three microbes are listed below. Name the product produced by each one of them and mention their use:

1. Aspergillus niger.
2. Trichoderma polysporum.
3. Monascus purpureus.

How did Hershey and Chase differentiate between DNA and protein in their experiment while proving that DNA is the genetic material?

When do the oogenesis and the spermatogenesis initiate in human females and males respectively?

Mrs. Peter and Mrs. James had babies at the same hospital. Mrs. Peter took home a girl, Nancy and Mrs. James received a boy, Richard. However, Mrs. James was certain she gave birth to a girl and brought suit against the hospital. Blood tests showed that Mr. James was type O, Mrs. James was type AB and Mr. and Mrs. Peter were both type B. Nancy was type A and Richard was type O. List the possible genotypes of each individual and then indicate the correct parents for each child.
Genotypes :

1. Mrs. Peter ____________.
2. Mr. Peter ______________.
3. Nancy _____________.
4. Mrs. James _________________.
5. Mr. James ________________.
6. Richard _______________.
7. Whose baby is Nancy?
8. Whose baby is Richard?

Name and describe the technique that helps in separating the DNA fragments formed by the use of restriction endonuclease.

Describe any three potential applications of genetically modified plants.