Dominant and Recessive Alleles

Q.

What is the mode of inheritance?

Q.

What are the 3 patterns of inheritance?

Q.

________will express the recessive character or trait.

1. F2 generation

2. Both A and B

3. None of the above

4. F1 generation

Q.

Is hair colour multiple alleles?

Q. ntwhen a albino man maary a woman whose father a was albino then how many boys , girl have new progeny affected/n

Q.

Question 4
A study found that children with light-coloured eyes are likely to have parents with light-coloured eyes. On this basis, can we say anything about whether the light eye colour trait is dominant or recessive? Why or why not?

Q.

Two pairs (A&B) are crossed as given below. Which coat colour (black or white) is dominant

1. Bagging and emasculation
2. Bagging and pollination
3. Harvesting and emasculation
4. Bagging and pollen collection

Q. A normal pea plant bearing coloured flowers suddenly starts producing white flowers. Whixh could possibly be the reason?

Q. A student makes a monohybrid cross between TT and tt plants, where T is dominant and t is recessive. Identify the correct statements on the basis of the information given.

Statement 1: Recessive traits are expressed in both ${\text{F}}_1$ and ${\text{F}}_2$ generation.

Statement 2: Recessive traits are expressed only in the absence of corresponding dominant trait in the offspring.

1. Only statement 1 is correct.
2. Only statement 2 is correct.
3. Both the statements are correct.
4. Both the statements are incorrect.

Q.

Define the following terms:

(c) Homozygous condition

Q.

Recessive gene can express itself only in________.

1. none of these conditions

2. homozygous condition

3. heterozygous condition

4. both above conditions

Q.

Which is the type of Gene that can express in both Homozygous and Heterozygous Conditions?

1. Dominant

2. Recessive

3. Both

4. None

Q. Five Mark Questions :
(a) Differentiate between dominance and codominance.
(b) explain codominance taking an example of human blood groups in the population

Q. A single recessive trait, able to express must be on
(a) Y chromosome
(b) X chromosome in male
(c) X chromosome in female
(d) autosome

Q.

The plant capable of producing white flowers consists of more red flowers in number over white flowers. It indicates that

1. Red colour is recessive

2. Red colour is dominant

3. White colour is dominant

4. Both colours are dominant

Q.

In Mendel’s experiments, the $F_1$ progeny resembles one of the two parents. The trait that is not seen is

1. Recessive

2. Dominant

3. Wild

4. Superior

Q. Assertion :In a diploid organism only dorminant mutations will show their effect immediately, recessive mutations do not influence the traits immediately. Reason: The recessive mutants accumulate in gene pool and once the recessive mutations has established homozygous state it is exposed to natural selection.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Q. An allele is said to be dominant if:

1. It is expressed only in heterozygous condition.
2. It is expressed only in homozygous condition.
3. It is expressed in both homozygous and heterozygous conditions.
4. It is expressed only in second generation.

Q. A single recessive trait, able to express must be on
(a) Y chromosome
(b) X chromosome in male
(c) X chromosome in female
(d) autosome

Q.

Suppose eye colour of humans is governed by one gene. If black eye colour is dominant over green eye colour, then which letter correctly represents the dominant allele and the recessive allele respectively?

1. G and B

2. g and B
   

3. B and b

4. b and g

Q.

The recessive genes located on the X-chromosome of humans are always

1. expressed in females

2. lethal

3. sub-lethal

4. expressed in males

Q.

The traits which are expressed in an individual in every condition are the recessive traits.

1. True

2. False

Q. X-linked recessive gene is

1. Lethal
2. Always expressed in male.
3. Sub lethal
4. Always expressed in female.

Q.

The dominant allele is represented by a lower case letter.

1. True

2. False

Q.

The traits which are expressed in an individual in every condition are the recessive traits.

1. True

2. False

Q. A single recessive trait, able to express must be on
(a) one Y chromosome
(b) one X chromosome
(c) autosome
(d) none of these

Q.

Recessive gene can express itself only in________.

1. both above conditions

2. none of these conditions

3. homozygous condition

4. heterozygous condition

Q. The recessive genes located on X-chromosome of humans are always

1. lethal
2. expressed in females
3. sub-lethal
4. Expressed in males

Q.

Give appropriate biological/technical terms for the following:

The suppressed allele of a gene.

Q.

If tall is dominant over short, then which of the following character will be expressed when both the dominant allele and recessive allele are present?

1. It is random

2. Tall

3. Short

4. Medium height