Which of the following is a recessive trait in Pisum sativum?

1.	Yellow pod color	2.	Axial flower position
3.	Inflated pod shape	4.	Violet flower color

In a dihybrid cross between two pea plants with round and yellow seeds [heterozygous at both loci], the yellow and green color will segregate in a ratio:

Identify an autosomal recessive inborn error of metabolism the effects of which can be completely overcome by regulating the diet of the affected individual:

Represented below is the inheritance pattern of a certain type of traits in humans. Which one of the following conditions could be an example of this pattern?

1.	Sickle cell anemia	2.	Haemophilia
3.	Thalassemia	4.	Phenylketonuria

Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character:

The salivary gland chromosomes in the dipteran larva, are useful in gene mapping because:

If Mendel might have studied 7 pairs of characters in a plant with 12 chromosomes instead of 14 then:

Mental retardation in man occurs due to:
1. Loss of one X chromosome
2. Addition of one X chromosome
3. Slight growth in Y
4. Overgrowth in Y

A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion of his sperm will be ABH?

A self-fertilizing trihybrid plant forms: