Dihybrid Cross

Q.

What is the ratio of a dihybrid cross?

Q.

If a round, green seeded pea plant (RRyy) is crossed with wrinkled, yellow seeded pea plant, (rrYY) the seeds produced in the F1 generation are

1. round and yellow

2. round and green

3. wrinkled and green

4. wrinkled and yellow

Q.

Dihybrid test cross ratio is

1. 9:3:3:1

2. 1:1:1:1

3. 3:1

4. 1:1

Q.

Two pea plants, one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F1 progeny that has round, yellow (RrYy) seeds. When F1 plants are selfed, the F2 progeny will have a new combination of characters. Choose the new combination from the following

(i) Round, yellow

(ii) Round, green

(iii) Wrinkled, yellow

(iv) Wrinkled, green

1. (i) and (ii)

2. (i) and (iv)

3. (ii) and (iii)

4. (i) and (iii)

Q.

Define homologous chromosomes?

Q. How many types of gametes will be formed when plant with genotype Yyrr is crossed with plant having YYRR genotype?

1. Three
2. Four
3. Two
4. Six

Q.

Question 1
A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic makeup of the tall parent can be depicted as
(a) TTVV
(b) TTvv
(c) TtVV
(d) TtVv

Q.

Pure-bred round -yellow pea seeds have genotype RRYY and the pure-bred wrinkled-green pea seeds have genotype rryy. Keeping this in mind, write the phenotypes of the following genotypes of hybrid pea seeds.

(a) Rryy (b) rrYy (c) rrYY (d) RrYy (e) RRyy

Q.

Which is the back cross in the Monohybrid cross?

Q.

A man with blue eyes and black hair marries a woman with black eyes and brown hair. A year later they have a child. The child has blue eyes and black hair. If black eyes (B) are dominant over blue eyes (b) and black hair (H) is dominant over brown hair (h), which of the following options correctly predicts the genotype of the child?

1. bbHH

2. BBHH

3. bbHh

4. BbHh

Q.

Why is sex-linked inheritance an example of Non-Mendelian inheritance?

Q.

A cross in which an organism showing a dominant phenotype is crossed with the recessive parent in order to know its genotype is called?

1. Back cross

2. Dihybrid cross

3. Test cross

4. Monohybrid cross

Q.

The genotype of green stemmed tomato plants is denoted by GG and that of purple-stemmed tomato plants as gg. When these two plants are crossed:

(a) What color of stem would be expected in their F1 progeny?

(b) Give the percentage of purple-stemmed plants if F1 plants are self-pollinated.

(c) In what ratio would you find the genotype GG and gg in the F2 progeny?

Q.

A heterozygous tall pea plant is crossed with the pure dwarf pea plant. The phenotypic ratio of breeding tall pea plants to breeding dwarf pea plants shall be______.

1. 1:1

2. 2:1

3. 3:1

4. 1:2

Q.

The phenotypic dihybrid ratio in F2 generation is ________.

1. 9:3:1

2. 9:3:3:1

3. 3:1:3

4. 3:1

Q.

A woman with blonde curly hair married a man with black soft hair. All of their children in first-generation had black soft hair but next-generation children had different combinations is ratio 9:3:3:1. State the law that governs this expression.

Q. A dihybrid cross between tall plant with round seeds and short plant with wrinkled seeds, in $F_1$ generation will produce plants______________.

1. Hybrid for tall and round seeds
2. Hybrid for tall and wrinkled seeds
3. Hybrid for short and round seeds
4. Pure for tall and round seeds

Q.

What experiment would we do to confirm that the F2 generation did in fact have a 1:2:1 ratio of TT, Tt, and tt trait combinations?

Q. In Mendel's dihybrid cross the phenotypic ratio was 9 : 3 : 3 : 1. Here 9 indicates

1. Wrinkled green seeds
2. Wrinkled yellow seeds
3. Round yellow seeds
4. Round green seeds

Q.

A cross between two individuals results in a ratio of 9 : 3 : 3 : 1 for four possible phenotypes of progeny. This is an example of a :

(a) dihybrid cross (b) monohybrid cross (c) test cross (d) none of these

Q.

A homozygous tall plant (TT) bearing red coloured(RR) flowers is crossed with a homozygous dwarf plant(tt) bearing white flowers(rr):

(a) Give the genotype and phenotype of the F1 generation.

(b) Give the possible combination of the gametes that can be obtained from the F1hybrid.

(c) Give the dihybrid ratio and the phenotype of the offsprings of F2 generation when two plants of the F1 generation above are crossed.

Q. What are alleles ?

Q.

What is the phenotypic ratio of a dihybrid cross?

Q. activity to understand mendilian principles of heredity

Q.

Show the Dihybrid cross gamete formation.

Q.

Crossing over results in separation of incompletely linked genes

1. False

2. True

Q.

A round seeded plant ( R ) is dominant to a wrinkled seeded plant ( r). What parental genotypes will produce offspring that are 50% homozygous dominant and 50% heterozygous dominant ?

1. rr and RR

2. RR and Rr

3. Rr and Rr

4. rr and rr

Q.

Do Linked Genes Sort Independently?

Q.

If the ratio of each phenotype of the seeds of pea plants in the $F_2$ generation is 9 : 3 : 3 : 1, it is known as :

(a) tetrahybrid (b) monohybrid ratio (c) dihybrid ratio (d) trihybrid ratio

Q.

________ diagram is the graphical representation of the possible genotypes of an offspring from a particular cross or breeding event.