Heredity

Q.

In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F₂ is

1. 1:3

2. 1:1

3. 1:2

4. 2:1

Q. Give examples of Homologous and Analogous organs.

Q.

Among lion, tiger and omestic cat, all the three have the same number of 38 chromosomes, yet they have different appearances. How do you account for such differences?

Q.

What is DNA copying? State its importance.

Q.

What is a dihybrid cross and give an example of it?

Q. Heterozygous round and yellow seeded pea plants were selfed and total 800 seeds are collected . what is the total number of seeds with first dominant and second reccessive traits?

Q.

How does the creation of variations in a species promote survival?

Q.

A homozygous round seeded plant (dominant trait) is crossed with a homozygous wrinkled seeded plant. What will be the percentage of round seeded plants in the F2 generation?

1. 25%

2. 50%

3. 100%

4. 75%

Q.

The term 'Genetics' was coined by

1. William Bateson

2. Gregor Mendel

3. Thomas Hunt Morgan

4. W. Johannsen

Q. What is genetic material? What is a it's importance

Q. Select the statements that are true for genes.

i. Genes are specific sequences of nucleotides in a DNA molecule.
ii. A gene does not store information for protein synthesis.
iii. In individuals of a given species, a specific gene is located on a particular chromosome.
iv. Each chromosome has only one gene.
v. Genome identification is the basis of DNA fingerprinting.

1. i, ii and iii
2. i, iii and v
3. i, iii and iv
4. ii, iv and v

Q.

Alleles of a gene are found on________.

1. the same chromosome

2. any chromosome

3. homologous chromosomes

4. non-homologous chromosomes

Q.

Industrial Melanism is an example of

1. natural selection

2. spontaneous generation

3. use and disuse theory

4. none of these

Q.

What is the chemical basis of heredity?

Q.

Is independent assortment violated by linkage?

Q.

What are the maternal and paternal chromosomes?

Q.

Select the incorrect match.

1. Allosomes – sex chromosomes

2. Submetacentric chromosomes – L-shaped chromosomes

3. Polytene chromosomes – oocytes of amphibians

4. Lamp brush chromosomes – Diplotene bivalents

Q. The branch of biology that deals with heredity and inheritance of characters is called _________.

1. genetics
2. mutation study
3. evolution
4. taxonomy

Q.

What is molecular phylogeny?

Q.

Genetics is the branch of science which deals with the study of_______.

1. cell function

2. cell structure

3. heredity and variation

4. relation between plant and environment

Q.

Cross between which pea plants is considered to be the test cross?

1. Two dominant plants

2. Two recessive plants

3. A dominant and a homozygous recessive plant

4. A dominant and heterozygous recessive plant

Q.

Which of the following statements is incorrect in connect with the law of segregation?

1. Alleles separate from each other during gametogenesis.

2. Segregation of factors is due to separation of chromosomes during gamete formation.

3. Law of segregation is called as law of purity of gametes.

4. Alleles blend with each other during gamete formation.

Q.

Why is DNA copying an essential part of the process of reproduction? [3 MARKS]

Q.

DNA is made up of genes or genes are made up of DNA?

Q.

Which one of the followoing genotypes is homozygous dominant and which one homozygous recessive in regard to tongue rolling:
Rr, rr, RR.

Q.

What does double heterozygous mean?

Q.

What is heredity

1. Transfer of characters from parents to child

2. Elementary education given at home

3. None of these

4. Influence of society on behaviour

Q.

Differentiate between homologous and analogous organs with 2 examples.

Q.

Selecting for arrested flower development in wild cabbage led to the development of which plant?

1. Cauliflower

2. Kale

3. Broccoli

4. Kohlrabi

Q.

Write 4 differences between homologous organ and analogous organ.