61.

Temporal isolation in breeding seasons between closely related species leads to reproductive isolation. Given below are breeding seasons of different species of frogs.

Which of the above plots represents temporal isolation in breeding seasons among closely related sympatric species?

• Plot A

• Plots A and B

• Plots B and C

• Plots A and C

Three species M, N, and O when grown independently in a laboratory showed typical logistic growth curves. However, when grown in pairs, the following growth curves were observed.

What interpretation regarding the interspecific relationship between  M, N, and O can be deduced from the above observations?

• N predates over O and therefore can also predate on M.

• N is competed out by M and O.

• N and O possibly have a prey-predator relationship.

• M and O exhibit prey-predator relationship.

During the course of evolution, the jawbones got modified into three ear ossicles in mammals. Which one of the following is a correct match of all three ear ossicles and their jawbones?

• stapes - articular; incus - quadrate; malleus - hyomandibular

• stapes - quadrate;incus - articular; malleus - hyomandibular

• stapes - articular; incus - hyomandibular; malleus - quadrate

• stapes - hyomandibular; incus - quadrate; malleus - articular

Given below are larval stages and phylum to which they belong. Select the INCORRECT combination.

• Parenchyma and Amphiblastula -Phylum Porifera

• Bipinnaria and Auricularia - Phylum Echinodermata

• Tornasia and Axolotl - Phylum Hemichordata

• Planula and Ephyra - Phylum Cnidaria

Match the two columns that represent plant organs (I) and parts within these organs (II).

Column I	Column II
A. Carpel	i. Petals, corolla
B. Perianth	ii. Vegetative cell, generative cell
C. Microsporocyte	iii. Stigma, style, ovary
D. Megasporocyte	iv. Antipodal cells, polar nuclei, synergid cells

• A - i; B - iii; C - ii; D - iv

• A - iii; B - iv; C - i; D - ii

• A - i; B - iii; C - iv; D - ii

• A - iii; B - i; C - ii; D - iv

Given below are statements on key characteristics of two fungal lineages.

(A) Microsporidia do not have true mitochondria.

(B) Most chytridsproduce flagellated gametes.

(C) Microsporidia are usually free-living.

(D) Chytrids reproduce sexually without a dikaryon stage.

Choose the combination with correct statements.

• A, B, and C only

• A, B, and D only

• B, C, and D only

• A and B only

Euphorbiaceae generally represents milky sap bearing plants but there are also some non-milky sap bearing plants that belong to this family. Identify the correct combination of the following given plants which belong to family Euphorbiaceae.

• Terminalia bellirica, Euphorbia hirta, Nerium indicum

• Mallotus philippense, Ficus religiosa, Ricinus communis

• Mallotus philippense, Acalypha indica, Emblica officinalis

• Acalypha indica, Ricinus communis, Mangifera indica.

Two inbred lines of beans were intercrossed. In F1 the variance in bean length was measure as 2.0. The F1 was selfed to obtain F2 and the variance in bean length in F2 was 7.0. The broad heritability of bean length in the F2 population will be:

• 0.75

• 9.0

• 5.0

• 0.71

In Drosophila, Bar eye (B) is a dominant mutation while miniature wing (m) and yellow body colour (y) are recessive mutations. Heterozygous females for these mutations were crossed to normal eyed miniature winged and yellow body-coloured males. Assume the following progeny was obtained:

Phenotypes	Number
B+m+y+	30
B m y+	25
B m+ y+	165
B+ m y+	120
B m y	20
B+ m y	185
B m+ y	110
B+ m+ y	45

Based on the results obtained, the order of genes will be:

A. B m y

B. m B y

The genetic distance between B and y will be:

C. 40 cM

D. 17.1 cM

The correct combination of answer is

• A and C

• B and C

• A and D

• B and D

In Burkitt's Lymphoma a reciprocal translocation between chromosome 8 and 14 is observed. If an individual is heterozygous for this translocation, the consequence in meiosis will be as follows:

A. Four chromosomes, i.e. normal chromosome 8 and 14, and translocated chromosome 8 and 14, pair together.

b. The two normal chromosomes 8 and 14 and two translocated chromosomes pair separately.

C. All gametes produced from this meiosis are non-viable as they have deletions and duplications.

D. In one of the cross configurations called "alternate segregation" all gametes having normal or translocated chromosomes, survive.

E. The gametes having normal chromosomes only survive while all gametes having translocated chromosomes are non-viable, hence the translocations are non-viable, hence the translocations are used as crossover suppressors.

Which of the following combinations best describes the meiotic consequences for the translocation described above?

• B and E

• B, C, and E

• A, C, and E

• A and D