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SAI International School
Subject- Biology
Chapter- Heredity And Evolution
Subtopic- Mendel's Contribution (Dihybrid cross), How do traits get
expressed?, Sex Determination
Module-24
Home Assignment- I

Objective- MCQ

A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were
1. all tall plants because
a. Tallness is the dominant trait
b. Shortness is the dominant trait
c. Tallness is the recessive trait
d. Height of pea plant is not governed by gene 'T' or 't'
2. If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea
plant, (rr YY) the seeds production in F1 generation are
a. Round and yellow
b. Round and green
c. Wrinkled and green
d. Wrinkled and yellow
3. Two pea plants, one with round green seeds (RRyy) and another with wrinkled yellow
(rrYY) seeds produce F 1 progeny that have round, yellow (RrYy) seeds. When F 1 plants
are selfed, the F 2 progeny will have new combination of characters. Choose the new
combination from the following.
(i) Round, yellow
(ii) Round, green
(iii) Wrinkled, yellow
(iv) Wrinkled, green
a. (i) and (ii)
b. (i) and (iv)
c. (ii) and (iii)
d. (i) and (iii)
4. In organisms with two copies of the same allele is
a. Homozygous for that trait
b. Heterozygous for that trait
c. Homologous for that allele
d. Heterologous for that allele
5. What is the probability that the progeny will be a boy?
a. 50%
b. 56%
c. 47.43%
d. It varies

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