Ecosystem — BIOLOGY STD 12 Science — Question

Given below is a table showing the genotypes and the phenotypes of blood groups in the human population.

Genotype	Phenotype
W	Y
IB IO	Z
IA IB	O
X	O

1. Identify the genotype Wand X, and the phenotype Y and Z.
2. Name the pattern of inheritance exhibited by the phenotypes Y and Z in the table.

Give the term/ reason:
Role of oxytocin during expulsion of the baby out of uterus.

Write an article on vaccination and immunization.

A flower of brinjal plant following the process of sexual reproduction produces 360 viable seeds.
Answer the following questions giving reasons:
What is the minimum number of pollen grains that must land on stigma for pollination?

A child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parents and the possible genotypes of the other offsprings.

Answer the following questions:
Why is follicular phase in the menstrual cycle also referred as proliferative phase? Explain.

Correct the following statements:

1. Surgical methods of contraception prevent gamete formation.
2. All sexually transmitted diseases are completely curable.
3. Oral pills are very popular contraceptives among the rural women.
4. In E. T. techniques, embryos are always transferred into the uterus.

What do you understand by infertility? Discuss in detail about techniques related with its solution.