Reproductive Health — BIOLOGY STD 12 Science — Question

All vertebrate embryos show some similarities at an early stage. Mention two such similarities. What do they indicate? Explain.

What is a karyotype? How is it useful?

Distinguish between
Litter and detritus.

Explain any one feature of cloning conductor.

Name a free-living and a symbiotic bacterium that serve as bio-fertilizer.Why are they so called?

A couple where both husband and wife are producing functional gametes, but the wife is still unable to conceive, is seeking medical aid. Describe any one method that you can suggest to this couple to become happy parents.

Why do people suffer from altitude sickness after reaching the high altitude regions? How does their body acclimatised after a couple of days?

Mention the importance of LH surge during menstrual cycle.

Which plant sap is used in making toddy? Mention the process involved in it.

A true breeding tall plant is crossed with a true breeding dwarf plant. F, progeny is 100% tall and F, has tall : dwarf in the ratio 3 : 1.

1. Explain why F, shows only one type of parental phenotype.
2. Name the patterns of inheritance in which the ratio deviates from above. Also mention the deviated phenotypic ratio.