Law of Dominance

Q.

Which Mendelian idea is depicted by a cross in which the F1 generation resembles both the parents?

1. Co-dominance

2. Law of Dominance

3. Inheritance of one gene

4. Incomplete dominance

Q. Which of the following statements is incorrect with respect to Morgan’s dihybrid cross?

1. Morgan carried out several dihybrid crosses in Drosophila to study genes that were sex-linked.
2. He observed that the two genes segregate independently of each other and the F2 ratio is 9:3:3:1.
3. He coined the term linkage to describe the physical association of genes on a chromosome.
4. Morgan conducted his experiment on Drosophila melanogaster.

Q.

In Dogs black court colour is dominant over white.What coloured dog will you choose to breed with a given black dog in order to find its genotype .What is this type of cross known As?

Q. How many total characters of pea plant were studied by Mendel during his experiments?

1. 2
2. 8
3. 7
4. 14

Q.

Which among the following statements is/are correct with respect to the law of dominance?

A. Each character is controlled by pair of discrete units called factors

B. In a dissimilar pair of factors one is dominant and the other is recessive

C. It explains the expression of one character in $F_1$ and both characters in $F_2$ generation.

D. Explains the proportion of 3:1 obtained in $F_2$ generation

1. A & B only

2. C& D only

3. C &A only

4. A, B, C & D

Q. In a multiple allele system, a gamete possess

1. 2 alleles
2. 3 alleles
3. 1 allele
4. 4 alleles

Q.

A particular garden pea plant produces plants that have only violet flowers.

(a) Is it homozygous or heterozygous dominant for the trait?

(b) How would you ensure its genotype? Explain with the help of crosses. [5]

Q.

Why are mendels law important?

Q.

What are the patterns that do not follow the simple rules of Mendelian Inheritance?

Q. Match the following:
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{A. Chromosomal theory of inheritance}& \text{I. Correns}\\ \text{B. Rediscovery of Mendel's work}& \text{II. Sturtevant}\\ \text{C. Gene mapping}& \text{III. Sutton}\\ \text{D. Linkage}& \text{IV. Morgan}\end{array}$

1. A-II, B-I, C-III, D-IV
2. A-III, B-II, C-IV, D-I
3. A-III, B-I, C-II, D-IV
4. A-IV, B-III, C-II.D-I

Q.

Law of Mendel, which is not completely applicable is:

1. Codominance

2. Law of segregation

3. Law of independent assortment

4. Law of dominance

Q. Match the following:
$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \text{A.}& \text{Chromosomal theory of inheritance}& \text{I.}& \text{Correns}\\ \text{B.}& \text{Linkage}& \text{II.}& \text{Sturtevant}\\ \text{C.}& \text{Gene mapping}& \text{III.}& \text{Sutton}\\ \text{D.}& \text{Rediscovery of Mendel`s work}& \text{IV.}& \text{Morgan}\end{array}$

1. A-I, B-II, C-III, D-IV
2. A-III, B-II, C-IV, D-I
3. A-III, B-IV, C-II, D-I
4. A-IV, B-III, C-II.D-I

Q. Which mendelian idea is depicted by a cross in which the $F_1$ generation resembles both the parents?

1. Incomplete dominance
2. Law of dominance
3. Inheritance of one gene
4. Codominance

Q. Pick out the correct statements.

I. Haemophilia is a sex linked recessive disease.
II. Inheritance pattern of haemophilia is the same as that of color blindness.
III. Phenylketonuria is an autosomal recessive gene disorder.
IV. Sickle cell anaemia is an X-linked recessive gene disorder.

1. I, III, and IV are correct
2. I, II, and III are correct
3. I and IV are correct
4. II and IV are correct

Q.

What was revealed in Gregor Mendels study of genetics?

Q. Choose the correct feature about the following phenomena.
I. Incomplete dominance
II. Co-dominance
III. Multiple alleles

1. Established by means of independent assortment
2. Follow Mendelian principles
3. Both a and b are correct
4. Exceptions to Mendelian principles

Q. The chromosomal theory of inheritance was experimentally verified by

1. Morgan
2. Bateson
3. Sutton and Boveri
4. Punnett

Q. Factors : Mendel :: Chromosomal theory of inheritance : __________ .

1. Correns
2. Sutton and Boveri
3. Hugo de Vries
4. Gregor J. Mendel

Q. "Acquired characters cannot be inherited until and unless they have an effect on germ cells"; this was stated by _______?

1. Weismann
2. Aristotle
3. T.H. Morgan
4. Louis Pasteur

Q. A pea plant with pure yellow (YY) round (RR) seeds were crossed with a plant having pure green (yy) wrinkled (rr) seeds.

(i) What would be the nature of the offsprings in the \(F_1\) – generation?

Q. Match the terms in Column I with their description in Column II and choose the correct option :
$\begin{array}{cccc}& ColumnI& & ColumnII\\ A.& Dominance& \left(i\right)& Manygenesgovernasinglecharacter\\ B.& Codominance& \left(ii\right)& Inaheterozygousorganismonlyonealleleexpressesitself\\ C.& Pleiotropy& \left(iii\right)& Inaheterozygousorganismbothallelesexpressthemselvesfully\\ D.& Polygenicinheritance& \left(iv\right)& Asinglegeneinfluencesmanycharacters\end{array}$

1. (a) - (iv) (b) - (iii) (c) - (i) (d) - (ii)
2. (a) - (ii) (b) - (iii) (c) - (iv) (d) - (i)
3. (a) - (iv) (b) - (i) (c) - (ii) (d) - (iii)
4. (a) - (ii) (b) - (i) (c) - (iv) (d) - (iii)

Q. How do Mendel's experiments show that the
(a) Traits may be dominant or recessive
(b) Traits are inherited independently

Q. In garden pea, round shape of seeds is dominant over wrinkled shape. A pea plant heterozygous for round shape of seed is selfed and 1600 seeds produced during the cross are subsequently germinated. How many seedlings would have the parental phenotype?

1. 1600
2. 800
3. 400
4. 1200

Q. Three Mark Questions :
A plant with purple flowers was crossed with white flowers producing 50 plants with only purple flowers. On selfing these plants produced 482 plants with purple flowers and 162 plants with white flowers. What gametic mechanism accounts for these results? Explain.

Q. Which law of Mendel cannot be explained by monohybrid cross?

Q. Skin pigmentation is determined by two genes and a woman is heterozygous for one gene and homozygous for other gene. She exhibits the homozygous trait herself and this is an example of

1. Epistasis
2. X-linkage
3. Pleiotropy
4. Codominance
5. Simple dominance

Q. Explain law of Dominance

Q. Three alleles namely $I^A,I^B$ and i control the blood grouping in human beings. How many genotypes are likely to be present in human population ____________.

1. 2
2. 4
3. 5
4. 6
5. 7

Q. Which one of the following traits studied by Mendel in garden pea was a recessive character?

1. Green pod colour
2. Axial flower positon
3. Green cotyledon colour
4. Yellow seed colour

Q.

Cytological evidence to Mendel’s law of segregation

1. Anaphase-II

2. Metaphase-I

3. Metaphase-II

4. Anaphase-I