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Question (21)

QN0036192

21 In the cross TT × tt, what type of genetic combination will all F1 plants receive?

(A) TT
(B) tt
(C) Tt
(D) TTT

Correct Answer: C

Explanation:

Each F1 plant receives T from one parent and t from the other, giving Tt.

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Question (22)

QN0036193

22 If T represents tallness and t represents shortness, which combination represents a heterozygous tall plant?

(A) TT
(B) Tt
(C) tt
(D) TTT

Correct Answer: B

Explanation:

Tt contains two different versions of the factor and shows tallness.

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Question (23)

QN0036194

23 Which statement correctly describes TT and Tt in Mendel's pea plants?

(A) Both are short
(B) Both are tall
(C) TT is short and Tt is tall
(D) TT is tall and Tt is short

Correct Answer: B

Explanation:

A single copy of T is sufficient to make the plant tall.

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Question (24)

QN0036195

24 In the F2 generation of the monohybrid cross, the genetic combinations TT, Tt and tt occur in the ratio

(A) 1:1:1
(B) 1:2:1
(C) 2:1:2
(D) 3:1:2

Correct Answer: B

Explanation:

The F2 genetic combination ratio is 1 TT : 2 Tt : 1 tt.

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Question (25)

QN0036196

25 In the same F2 generation, the observable tall-to-short ratio is

(A) 1:1
(B) 1:2
(C) 3:1
(D) 2:1

Correct Answer: C

Explanation:

TT and Tt are tall, while only tt is short, giving a 3:1 ratio.

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Question (26)

QN0036197

26 Which statement best explains why a recessive trait can disappear in F1 but reappear in F2?

(A) The recessive factor is destroyed in F1
(B) The recessive factor is inherited but not expressed in the presence of the dominant factor
(C) The recessive factor is created only in F2
(D) The recessive factor is environmental

Correct Answer: B

Explanation:

The recessive trait can remain present in F1 but is masked by the dominant trait.

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Question (27)

QN0036198

27 Mendel's experiments showed that traits with different characteristics can be

(A) independently inherited
(B) inherited only together
(C) inherited only from the mother
(D) inherited only from the father

Correct Answer: A

Explanation:

Mendel's dihybrid experiments showed independent inheritance of different traits.

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Question (28)

QN0036199

28 In Mendel's experiment involving seed shape and seed colour, which two traits were studied?

(A) Tall/short and violet/white
(B) Round/wrinkled and green/yellow
(C) Tall/short and round/wrinkled
(D) Violet/white and tall/short only

Correct Answer: B

Explanation:

The dihybrid experiment considered seed shape and seed colour.

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Question (29)

QN0036200

29 A tall plant with round seeds is crossed with a short plant with wrinkled seeds. The F1 progeny are expected to be

(A) short and wrinkled
(B) tall and round
(C) tall and wrinkled only
(D) short and round only

Correct Answer: B

Explanation:

Tallness and round seeds are the dominant traits in the described cross.

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Question (30)

QN0036201

30 In the F2 generation of a dihybrid cross, some offspring show new combinations of traits. This happens because

(A) the traits are independently inherited
(B) all genes are identical
(C) no recombination occurs
(D) only dominant traits are inherited

Correct Answer: A

Explanation:

Independent inheritance allows new combinations of traits to appear.

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Question (21)

21 In the cross TT × tt, what type of genetic combination will all F1 plants receive?

Explanation:

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Question (22)

22 If T represents tallness and t represents shortness, which combination represents a heterozygous tall plant?

Explanation:

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Question (23)

23 Which statement correctly describes TT and Tt in Mendel's pea plants?

Explanation:

Link:

Question (24)

24 In the F2 generation of the monohybrid cross, the genetic combinations TT, Tt and tt occur in the ratio

Explanation:

Link:

Question (25)

25 In the same F2 generation, the observable tall-to-short ratio is

Explanation:

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Question (26)

26 Which statement best explains why a recessive trait can disappear in F1 but reappear in F2?

Explanation:

Link:

Question (27)

27 Mendel's experiments showed that traits with different characteristics can be

Explanation:

Link:

Question (28)

28 In Mendel's experiment involving seed shape and seed colour, which two traits were studied?

Explanation:

Link:

Question (29)

29 A tall plant with round seeds is crossed with a short plant with wrinkled seeds. The F1 progeny are expected to be

Explanation:

Link:

Question (30)

30 In the F2 generation of a dihybrid cross, some offspring show new combinations of traits. This happens because

Explanation:

Link:

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