Human Health and Disease — BIOLOGY STD 12 Science — Question

Complete the following table using alphabets (a to k)

DNA triplet 3’ → 5’	mRNA codon 5’ → 3’	Anticodon	Amino acid
a	b	UAC	c
d	UGG	e	Tryptophan
AAG	f	g	h
i	j	GAC	k

What is Central Dogma

What is self-incompatibility? Why does self- pollination not lead to seed formation in self- incompatible species?

Name the four levels of group organization of living things in order of increasing size.

What happens when chromatids fail to segregate during cell division cycle? Explain your answer with an example.

Mention the main reprodutive events in humans.

Point out the interaction between :
(a) Cuscuta growing on some angiospermic tree
(b) Orchid growing on a mango tree
(c) Wasp pollinating fig inflorescence
(d) Smaller branches disappeared when Balanus dominated on the coast of Scotland
(e) Mycorrhizae on the roots of higher plants
(f) Birds and Cattle

What do you understand by Biome? Explain.

Give the name of structures by which testes are suspended in the scrotum.

Given below are the stages in human reproduction. Write them in correct sequential order.
Insemination, Gametogenesis, Fertilisation, Parturition, Gestation, Implantation