Definition of Back Cross

Q. Test cross is a cross between:

1. Hybrid $\times$ Dominant parent $(Tt\times TT)$
2. Hybrid $\times$ Recessive parent $(Tt\times tt)$
3. Hybrid $\times$ Hybrid $(Tt\times Tt)$
4. All the above

Q.

Total number of phenotypes and genotypes in F2 generation of a trihybrid cross would ?

(1)

35

(2)

27

(3)

8

(4)

64

Q. A cross of F1 hybrid with either of the two parents is known as

1. Test cross
2. Reciprocal cross
3. Monohybrid cross
4. Back cross

Q.

A common test to find the genotype of a hybrid is by

(a)crossing one of the F₂ progeny with male parent.

(b)crossing one of the F₂ progeny with female parent

(c)studying the sexual behaviour of F₁ progenies

(d)crossing of one F₁ progeny with male parent

Q. The violet color of a flower is dominant over white color. Pure lines of violet-flowered plant and white-flowered plant were crossed (cross I). In another cross (cross II), the obtained progeny was crossed with the parent plant bearing white flowers. Which type of cross can cross II be considered or classified as?

1. Monohybrid cross only
2. Reciprocal cross only
3. Back cross only
4. Both monohybrid and back cross

Q.

What is a test cross? How does it differ from a reciprocal cross?

Q.

Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross are known as:

1. Reciprocal cross

2. Test cross

3. Reverse cross

4. Dihybrid cross

Q. what is back cross ?

Q. If an agouti mice (CcAa) is crossed with albino mice (ccAA), then how many albino mice can be produced in resulting four progeny?

1. 2
2. 4
3. 9
4. 3

Q. Write name of the first transgenic crop in India.

Q. Parents of blood groups O and AB cannot have a child of group AB because

1. Gene O is dominant over gene A
2. Gene A and B are absent in one of the parents
   
3. Gene O is dominant over gene B
4. None of the above

Q. Select the option that correctly identifies the number of correct statements.

I. Reciprocal cross is always a type of monohybrid cross
II. Test cross is always type of monohybrid cross
III. Back cross is always a type of monohybrid cross
IV. Back cross is a type of test cross
V. Test cross is a type of back cross

1. 4
2. 3
3. 2
4. 1

Q. What is linkage? Describe its types. Give four factors affecting Linkage.

Q. The cross between $F_1$ individual with either of the two parents is known as:

1. test cross
2. back cross
3. reciprocal cross
4. dihybrid cross

Q. ABO blood grouping is controlled by gene I which has three alleles and show codominance. There are six genotypes. How many phenotypes are possible?

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

Q. Choose the correct answer from the alternatives given.

1. Long winged - 192, Vestigial winged 0
2. Long winged 64, Vestigial winged - 128
3. Long winged - 96, Vestigial winged 96.
4. Long winged - 128, Vestigial winged 64

Q. Test cross is a cross between:

1. Hybrid $\times$ Dominant parent $(Tt\times TT)$
2. Hybrid $\times$ Recessive parent $(Tt\times tt)$
3. Hybrid $\times$ Hybrid $(Tt\times Tt)$
4. All the above

Q. In a dihybrid cross AABB $\times$ aabb, $F_2$ progeny of AABB, AABb, AaBB and AaBb occurs in the ratio of

1. 9 : 3 : 3 : 1
2. 1 : 1 : 1 : 1
3. 1 : 2 : 2 : 1
4. 1 : 2 : 2 : 4

Q. What are multiple alleles ? Describe multiple alleles with the help of ABO blood group in man.

Q. Match the genetic phenomena with their respective ratios.

	List I		List II
A	Inhibitory gene ratio	1	9:3:4
B	Complementary gene ratio	2	1:1:1:1
C	Recessive epistasis ratio	3	12:3:1
D	Dihybrid test cross ratio	4	9:7
E	Dominant epistasis ratio	5	13:3

1. a- 5, b- 4, c- 3, d- 2, e- 1
   
2. a- 4, b- 5, c- 1, d- 2, e- 3
   
3. a- 1, b- 2, c- 4, d- 3, e- 5
   
4. a- 5, b- 4, c- 1, d- 2, e- 3
   
5. a- 2, b- 1, c- 4, d- 5, e- 3
   

Q. A cross of F1 hybrid with either of the two parents is known as

1. Test cross
2. Reciprocal cross
3. Monohybrid cross
4. Back cross

Q.

The cross between $F_1$ individual with any one of the parents is called ___.

1. Back cross

2. Test cross

3. Reciprocal cross

4. Top cross

Q. In Drosophila, normal wings (+) are dominant to vestigial wings (vg) and the presence of eyes (+) is dominant to being eyeless (ey). The offspring of a cross between two unknown parents yielded the following results: 299 normal winged, normal eyed flies; 106 normal winged, eyeless flies; 99 vestigial winged, normal eyed flies, and 33 vestigial winged, eyeless flies.
What genotypes did the parent generation most likely possess?

1. +vg/+ey x +vg/+ey
2. vgvg, /++ x ++/eyey
3. ++/++ x vgvg/++
4. vgvg/eyey x +vg/eyey
5. +vg/+ey x vgvg/eyey

Q. In the fruit fly, normal wings (W) is dominant over the vestigial wings (w). On the crossing of two normal-winged flies, 76 normal-winged and 23 vestigial-winged offspring are produced. Which of the following would be the possible genotype of parents?

1. WW and ww
2. WW and Ww
3. Ww and ww
4. Ww and Ww
5. WW and WW

Q. Inheritance of ABO blood grouping is an example of

1. Dominance
2. Incomplete dominance
3. Both A and B
4. Co-dominance

Q. Differentiate between.
Test cross and reciprocal cross

Q. Blood group of Riddhi is 'A' and her mother Ramilaben has also blood group 'A'. Which blood group can be present in her father ________.

1. B, O
2. B, A
3. A, B, AB or O
4. A, O.

Q. The test cross of a $F_1$ individual with genotype (++ / ab) produced the following offsprings ++/ab 10, ab/ab 10, +a.ab 40 +b/ab 40. Based on this data, predict the configuration of $F_1$ heterozygous.

1. trans-configuration
2. cis-configuration
3. both (a) and (b)
4. None of these

Q. How many types of gametes would be formed by the F${}_1$ generation obtained by the cross between AABBCC and aabbcc?
[0.7 mark]

1. 6
2. 8
3. 16
4. 4

Q. How many pairs of contrasting traits are studied in trihybrid cross?

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