Home
Class 12
BIOLOGY
Refer the given statements and select th...

Refer the given statements and select the correct option
(i) Percentage of homozygous dominant individuals obtained by selfing Aa individuals is 25 %
(ii) Types of genetically different gametes produce by genotype AABbcc are 2
(iii) Phenotypic ratio of monohybrid `F_(2)` progeny in case of Mirabilis jalapa is `3 :1`

A

All the statements are true

B

Statements (i) and (ii) are true, but statement (iii) is false

C

Statement (i) and (iii) are true, but statement (ii) is false

D

Statements (ii) and (iii) are true, but statement (i) is false

Text Solution

Verified by Experts

The correct Answer is:
B

The phenotypic ratio of monohybrid `F_(2)` generation in case of Mirabilis jalapa is 1 Red : 2 Pink : 1 White, due to incomplete dominance.
Promotional Banner

Similar Questions

Explore conceptually related problems

Read the given statements and select the correct option Statement 1 : Test cross is used to determine an unknown genotype within one breeding generation Statement 2 : Test cross is a cross between F_(1) hybrid and dominant parent.

Read the given statements and select the correct option Statement 1 : Physiological capacity of organisms to produce off spring under natural conditions is called as reproductive potential Statement 2 : Minimum number of individuals which an environment can sustin is referred to as its carrying capacity

Study the following statements regarding food chains and select the correct ones. (i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation. (ii) Removal of most of the carnivores resulted in an increased population of deers. (iii) The lenght of food chains is generally limited to 3-4 trophic levels due to energy loss. (iv) The lenght of food chains may vary from 2 to 8 trophic levels. A) i and ii B) ii and iii C) i and iii D) iii and iv

Consider the following three statements and select the correct option starting which ones are tube (T) and which ones are false (F). (i) Hybridisation is crossing of two or more types pf plants for bringing their traits together in progeny. (ii) Semi-dwarf rice varieties were derived from IR-8 and Taichung Native -1. (iii) Hybrid breeding have led to the development of several high yeilding resistant to water stress.

Morgan hybridised yellow-bodied, white-eyed females to brown-bodied red-eyed males and intercrossed their F_(1) progeny. He observed that (a) F_(2) ratio was deviated very significantly from the 9:3:3:1 ratio (b) Both genes did not segregate independently of each other (c) Recombinant types are not obtained in F_(2) generation (d) Both genes segregate independently of each other Select the correct set of statements :

Match the terms given in list I with their description in list II and select the correct option from the codes given below. {:("List I", "List II"), ("Helper T-cells", 1. "Cells that are active in production of antibodies"),("Plasma cells", 2. "Activate T or B-lymphocytes to become plasma cells"),("Killer T-cells", 3. "Protein produced by virus infected cell"),("Interferon", 4. "Combine with antigen causing lysis and release of cytokins"):}

In a dihybrid cross, white-eyed, yellow -bodied female Drosophila was crossed with red-eyed, brown - bodied male Drosophila, produced in F_(2) - generation are 1.3% recombinants and 98.7% progeny with parental type combinations. This observation of Morgan deviated from Mendelian F_(2) - phenotypic dihybrid ratio. Explain giving reasons, Morgan's observations

Match column I with column II and select the correct answer from the given codes. {:(Column I, Column II),(A."Recombinant DNA",(i)"Chilled ethanol"),(B."Precipitation of DNA",(ii)DNA "staining"),(C."Transposons",(iii)"Jumping genes"),(D."Ethidium bromide",(iv)"Genetic engineering"):} 1) A − ( i v ) , B − ( i ) , C − ( i i i ) , D − ( i i ) 2) A − ( i ) , B − ( i i i ) , C − ( i i ) , D − ( i v ) 3) A − ( i i ) , B − ( i ) , C − ( i i i ) , D − ( i v ) 4) A − ( i v ) , B − ( i i ) , C − ( i ) , D − ( i i i )

Match the types of WBC listed under column I with the shape of nucleus given under column II and select the correct option from codes given below {:(,"Column I",,"Column II"),("A.","Neutrophils","(i)","Kidney-shaped"),("B.","Eosinophils","(ii)","S-shaped"),("C.","Basophils","(iii)","3 to 5 lobes"),("D.","Monocyte","(iv)","2 lobes"),(,,"(v)","Disc-shaped"):}

Match the column I with column II and choose the correct combination from the options given. {:(" Column I",," Column II"),("(Component)",,"(% of the total cellular mass)"),(A."""Ions ",,(i)"1"),(B."" "Lipids",,(ii)"2"),(C."" "Carbohydrates",,(iii)"3"),(D."""Nucleic acids",,(iv)"5-7"),(E."""Proteins",,(v) "10-15"):}