Homozygous and Heterozygous

Q.

The cross between an individual with unknown genotype and recessive parent is called a ___.

1. Top cross

2. Inter cross

3. Test cross

4. Batch cross

Q.

Which of the following represent(s) a heterozygous condition?

1. Tt

2. tt

3. Both A and C

4. TT

Q.

A couple with curly haired husband and straight haired wife have all their children curly haired because

1. Husband is homozygous and wife is heterozygous

2. Husband is heterozygous while wife homozygous

3. Both are homozygous

4. Both are heterozygous

Q. A heterozygous individual has ___.

1. Two dominant alleles

2. Two recessive alleles

3. One dominant allele and one recessive allele

4. One dominant trait and one recessive trait

Q.

A cross is made between true breeding lines of pea plants with axillary (A) and terminal (a) flowers. What is the ratio between the number of possible genotypes of homozygous and heterozygous plants in ${\text{F}}_2$ progeny?

1. 3:1

2. 1:2:1

3. 1:1

4. 1:1:2

Q.

Repeated selfing produces:

1. Impure hybrids

2. Heterozygosity

3. Homozygosity

4. Pure hybrids

Q.

A parent that produces only one type of gamete for an allele is called:

1. Heterozygous

2. Homozygous

3. Homologous

4. Hemizygous

Q.

A person who is said to be homozygous has

1. Two dominant alleles

2. Two recessive alleles

3. One dominant allele and one recessive allele

4. One dominant trait and one recessive trait

Q.

An organism with two identical copies of the same gene is called

1. Phenotype

2. Genotype

3. Heterozygote

4. Homozygote

Q.

Match the following:

$\begin{array}{cc}ColumnI& ColumnII\\ \text{A. Locus}& \text{1. Genetic makeup of an organism.}\\ \text{B. Homozygous}& \text{2. Both the alleles of a gene are non-identical.}\\ \text{C. Heterozygous}& \text{3. Both the alleles of a gene are identical.}\\ \text{D. Phenotype}& \text{4. Position of gene on chromosome.}\\ \text{E. Genotype}& \text{5. Physical expression of gene.}\end{array}$

1. A-4, B-3, C-2, D-5, E-1

2. A-4, B-3, C-2, D-1, E-5

3. A-1, B-1, C-3, D-4, E-5

4. A-5, B-4, C-3, D-2, E-1