Homozygous and Heterozygous

Q.

What traits do daughters inherit from their fathers?

Q.

What is a wild type strain?

Q.

How many alleles does a trait have?

Q. Match the following terms in genetics to their respective defining words.

1. Identical alleles
2. External appearance
3. Gene for a trait
4. Different alleles

Q. State whether true or false:
The ratio A+T/G+C remains constant for a particular species.

1. True
2. False

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 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. Define the following:
(i) Genotype
(ii) phenotype
(iii) Homozygous
(iv) Heterozygous
(v) Allele
(vi) Dominant
(vii) Recessive

Q.

Repeated selfing produces:

1. Impure hybrids

2. Heterozygosity

3. Homozygosity

4. Pure hybrids

Q. A heterozygous individual has ___.

1. Two dominant alleles

2. Two recessive alleles

3. One dominant allele and one recessive allele

4. One dominant and two recessive alleles

Q. What will be the genetic constitution of the offspring of a cross of individuals heterozygous (Zz) for an allele?

1. All ZZ
2. 1/2 ZZ : 1/2 zz
3. All zz
4. 1/4 ZZ : 1/2 Zz : 1/4 zz

Q.

How does crossing over between non-sister homologous chromatids produce different gene combinations?

Q.

Linked genes separate due to

1. Mutation

2. Crossing over

3. Recombination

4. None of the above

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.

What is the full form of BCG?

Enter not more than 5 words.

Q. Match the following terms in genetics to their respective defining words.

1. Identical alleles
2. External appearance
3. Genetic makeup
4. Different alleles

Q.

Define homozygous.

Q. Cross AABb X aaBb yields AaBB : AaBb : Aabb : aabb offsprings in the ratio of

1. 0 : 3 : 1 : 1
2. 1 : 1 : 1 : 1
3. 1 : 2 : 1 : 0
4. 1 : 2 : 1 : 1

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. 1.what is guanidine ?

Q. In Mendel's experiments, colour of seed coat, nature of flower, position of flower, colour of pod, height of stem, are called as

1. Alleles
2. Genotype
3. Phenotype
4. All of the above

Q.

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

1. Phenotype

2. Genotype

3. Heterozygote

4. Homozygote

Q. If thita1=7/25 and thita2=24/25 then find relation between thita1 and thita2

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

Q.

Repeated selfings produces:

1. Heterozygosity

2. Homozygosity

3. Impure hybrids

4. Pure hybrids

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. Which genotype represents a true dihybrid condition?

1. tt rr
2. Tt rr
3. Tt Rr
4. Tr RR

Q.

Given below are groups of terms. In each group the first pair indicates the relationship between the two terms. Re­write and complete the second pair on a similar basis.

Example: Oxygen : Inspiration :: Carbon dioxide : Expiration.

TT : Homozygous : : Tt: >

Q.

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

1. Tt

2. tt

3. Both A and C

4. TT

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