Definition of Locus

Q. How many types of gametes can be produced by a diploid organism that is heterozygous for 3 loci?

1. 4
2. 8
3. 16
4. 32

Q.

A diploid organism is heterozygous for four loci, how many types of gametes can be produced?

Q. The position of a gene on a chromosome is called locus.

1. True
2. False

Q.

What is same in homologous chromosomes?

Q. A diploid organism is heterozygous for 4 loci, how many types of gametes can be produced?

Q. A man with blood group $A$ marries a woman with blood group $O$ and their daughter has blood group $O$.

Q. When both parents are of blood type AB, they can have children with

1. A, B, AB and O blood types
2. A and B blood types
3. A, B and AB blood types
4. A, B and O blood types
5. A, AB and O blood types

Q. A man of A blood group marries a woman of AB blood group. Which type of progeny would indicate that man is heterozygous A?

1. AB
2. A
3. O
4. B

Q. Multiple alleles represent

1. More than two alternate forms of a gene found at same locus
2. More than two alternate forms of a gene found at different loci
3. None of the above
4. Occurrence of one gene in two chromosomes

Q. The important things to remember are that chromosomes as well as genes occur in ____A___. The two alleles of a gene pair are located on homologous sites on ___B___ chromosomes. Choose the correct choice for A and B.

1. A-single, B-analogous
2. A-single, B-heterozygous
3. A-pair, B-analogous
4. A-pair, B-homologous

Q. How many types of gametes are expected from the organism with genotype AA BB CC?

1. One
2. Eight
3. Two
4. Four

Q. Choose the correct answer from the alternatives given.

1. 8
2. 32
3. 16
4. 4

Q. Pseudoalleles are

1. Two closely placed genes with nearly similar expression
2. Forms of same allele
3. Mutations in different genes producing alleles with similar effect
4. Alleles producing similar effect under changed conditions.

Q. How many types of gametes are possible from a diploid organism having genotype AaBBCC?

Q.

The exact position occupied by a gene or a factor on a chromosome is called:

1. Locus

2. Homozygous

3. Homologous

4. Chromomere

Q. The distance between A and B genes is too long on a chromosome, the strength of linkage between them is

1. More
2. Less
3. No relation to distance
4. Same irrespective of close or distant location

Q. Match the columns I and II.

	I		II
1.	450 - 700 genes	a.	Escherichia coli
2.	4, 000 genes	b.	Drosophila melanogaster
3.	13, 000 genes	c.	Mycoplasma
4.	32, 000 - 50, 000 genes	d.	Homo sapiens
5.	20, 000 - 30, 000 genes	e.	Oryza sativa

1. 1- b, 2- a, 3- e, 4- c, 5- d
2. 1- c, 2- a, 3- b, 4- e, 5- d
3. 1- c, 2- b, 3- a, 4- e, 5- d
4. 1- b, 2- c, 3- a, 4- e, 5- d

Q.

The exact position occupied by a gene or a factor on a chromosome is called:

1. Locus

2. Homozygous

3. Homologous

4. Chromomere

Q. The position of a gene on a chromosome is called locus.

1. True
2. False

Q. Genes located on same locus but having different expressions are

1. Oncogenes
2. Multiple alleles
3. Polygenes
4. Codominants