Mendel's Work

Q. Which of the following is correct regarding the genotype of an organism?

1. It is the genetic constitution or makeup of an organism
2. It is the set of observable characters of an organism
3. It is the molecular response of an organism to an environmental stimulus
4. None of these

Q. Assertion (A) : The sex of a child in human beings will be determined by the type of chromosome he/she inherits from the father.
Reason (R) : A child who inherits ‘X’ chromosome from his father would be a girl (XX), while a child who inherits a ‘Y’ chromosome from the father would be a boy (XY).

1. Both (A) and (R) are true, but (R) is not the correct explanation of the assertion (A).
2. (A) is false, but (R) is true.
3. Both (A) and (R) are true and (R) is the correct explanation of the assertion (A).
4. (A) is true, but (R) is, false.

Q.

Choose the correct option regarding the two given statements.

Statement 1: Half of the genetic information in a child comes from father.

Statement 2: Environment does not affect the phenotype (observable characteristics or traits) of a person at all.

1. Only 1 is correct
2. Both 1 and 2 are correct
3. Only 2 is correct
4. Both are incorrect

Q.

When a gene exists in more than one form, the different forms are termed as _______.

1. alleles

2. dominant
3. recessive
4. traits

Q.

Plant height and its growth is regulated by hormones. Hormone production is controlled by ___________.

1. proteins which control growth

2. essential nutrients supplied from soil

3. nucleus and certain minerals in the cytoplasm of plant cells

4. genes which control enzyme activity for hormone production

Q.

The genetic composition of an organism is known as

1. genotype

2. physiotype

3. phenotype

4. morphotype

Q.

Phenotypic expression may change with environmental change.

1. True

2. False

Q.

The physical appearance of an individual is known as

1. heterotype

2. genotype

3. phenotype

4. morphotype

Q.

Different versions of the same gene are called _______.

1. centromere

2. alleles

3. gametes

4. chromosomes

Q.

Which of the following statements about alleles is not true?

1. There may be several at a locus

2. One may be dominant over another

3. They may show incomplete dominance

4. They occupy different loci on the same chromosome