Laws of Mendel

Q.

What is heredity?

Q.

In Drosophila, the red-eye character is dominant over white eye character. When a homozygous red-eyed individual is crossed with a homozygous white-eyed individual, and individuals of $F_1$ generation are intercrossed, 12 individuals are produced. White-eyed individuals of these will be:

1. 9

2. 3

3. 6

4. 12

Q.

What does the Notation “tt” mean to Geneticists?

Q.

State the three Mendel's laws of inheritance.

Q.

What are the three laws of Mendel?

Q.

Which law is also known as the law of purity of gametes?

1. Male parent - AaBB and Female parent - AaBb

2. Male parent - AABB and Female parent - Aabb

3. Male parent - aaBB and Female parent - AaBb

4. male parent - AaBb and Female parent - aaBB

Q. A cross between parent pea plants having green round seeds with those having yellow wrinkled seeds would produce ${\text{F}}_1$ plants with ____.

1. round yellow seeds
2. wrinkled yellow seeds
3. round green seeds
4. wrinkled green seeds

Q.

What do you mean by law of dominance?

Q.

The 9:3:3:1 dihybrid ratio is due to
(a) Segeregation (b) crossing over (c) independent assortment
(d) homologus pairing

Q.

Which Mendels law of inheritance is universally accepted without any exception?

Q.

Appearance of recessive characters in F2 generation is due to ………………………

1. combination of alleles in F1 generation

2. segregation of alleles in F1 generation

3. multiplication of alleles in F1 generation

4. Both A and B

Q. Explain Mendel law.

Q.

A plant with green pods and smooth seeds with genotype Ggss will give rise to the following gametes:
(a) Gg and Ss (b) Gs and ss (c) Gs and gs (d) Gg and gs

Q.

Emasculation in plant breeding is:

1. removal of anthers to prevent self pollination

2. removal of carpels to prevent self pollination

3. removal of sepals to prevent cross pollination

4. removal of petals to prevent cross pollination

Q. Question 35
Why did Mendel choose pea plant for his experiments?

Q. Which of the following options correctly predicts all the types of gametes that can be formed from the genotype TtYy (heterozygous tall plant and heterozygous yellow seed color plant)?

1. TY, Ty, tY and ty
2. Tt and Yy
3. TY and ty
4. Ty and TY

Q. (a) State Mendel's Law of dominance.
(b) What is a dihybrid ratio?
(c) Define phenotype.
(d) What are autosomes? [4 MARKS]

Q.

Who discovered law of inheritance?

Q. Given below is the list of vegetables available in the market. Select from these the two vegetables having homologous structures :
Potato, sweet potato, ginger, radish, tomato, carrot, okra (Lady's finger)
(a) Potato and sweet potato
(b) Radish and carrot
(c) Okra and sweet potato
(d) Potato and tomato

Q.

Is eye colour a co-dominant trait?

Q.

What is the difference between codominance and epistasis?

Q.

Mendelism is related with________.

1. Heredity in living beings

2. Meiosis during sexual reproduction

3. Mutations in plants and animals

4. Evolution in living organisms

Q.

The _______ character appears in F1 generation when the progenies are heterozygous.

Q.

Blue eye colour in human is recessive to brown eye colour. The expected children of a blue-eyed woman and a brown-eyed man who had a blue-eyed mother is likely to be in the ratio of:

1. All blue-eyed

2. Three blue-eyed and one brown-eyed

3. All brown-eyed

4. One blue-eyed and one brown-eyed

Q.

Considering tallness and dwarfness, tallness is more widespread among pea plants because

1. Tallness is dominant over dwarfness.

2. Tallness is determined by one gene having many effects.

3. Tallness is determined by many genes having multiple effects.

4. Only tall pea plants are selected for further plantation.

Q.

A pure tall plant (TT) is crossed with a pure dwarf plant (tt).

Draw Punnett squares to show (1) F₁ generation (2) F₂ generation.?

Q.

Define

(i) Law of segregation

(ii) Law of independent assortment

(iii) Law of dominance

Q. Round seed trait (R) is dominant over wrinkled (r) seed trait in Pea. Heterozygous round seeded plant (Rr) is crossed with wrinkled seeded plant (rr). What is the possible progeny?

1. 302 round : 102 wrinkled
2. 105 round : 99 wrinkled
3. 210 round : 95 wrinkled
4. 103 round : 315 wrinkled

Q.

Mendel’s hybridization strategy was using two plants_________

1. differing in growth patterns

2. differing in contrasting characters

3. similar in two different characters

4. similar in many characters

Q.

What is Mendels law of segregation?