Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

1.     1.  Heterozygous tall and red flower pea plants were selfed and  total 2000 seeds are collected. What is the total number of seeds for both heterozygous traits?                               2.  In a cross between a pure tall pea plant with green pod and a pure short plant with yellow pod, how many short plant out of 16 would you expect in F2 generation?  
Asked by Sahil Kumar | 20 Mar, 2017, 06:05: PM
answered-by-expert Expert Answer

Hi Sahil,

1. The genotype of the plant heterozygous tall with red flowers is TtRr.

On self-pollination,

Parents: TtRr × TtRr

Gametes: TR, tR, Tr, tr

Progeny:

 

TR

tR

Tr

tr

TR

TTRR

TtRR

TTRr

TtRr

tR

TtRR

ttRR

TtRr

ttRr

Tr

TTRr

TtRr

TTrr

Ttrr

tr

TtRr

ttRr

Ttrr

ttrr

 So, 25% of the progeny is heterozygous for the trait.

Now, out of 2000 seeds, the number of seeds that are heterozygous for the trait = 25% of 2000 = 500.

Hence, 500 seeds would be heterozygous for the trait.

 

2. Genotype

Pure tall plant with green pod: TTYY

Pure short plant with yellow pod: ttyy

Gametes: TY, ty

Progeny in F1 generation : TtYy

Self-pollination of F1 generation: TtYy × TtYy

Gametes: TY, tY, Ty, ty

Progeny in F2 generation:

 

TY

tY

Ty

ty

TY

TTYY

TtYY

TTYy

TtYy

tY

TtYY

ttYY

TTYy

ttYy

Ty

TTYy

TtYy

TTyy

Ttyy

ty

TtYy

ttYy

Ttyy

ttyy

So, out of 16 progeny, 4 progeny would be short.

Answered by | 20 Mar, 2017, 06:36: PM
CBSE 10 - Biology
Asked by ar3886267 | 01 Mar, 2024, 05:57: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by janu69659 | 28 Feb, 2024, 09:12: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by nsubhashree54 | 24 Feb, 2024, 11:08: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by baibhabsenapati | 16 Feb, 2024, 01:29: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by mohammedtaiyabt | 14 Feb, 2024, 05:42: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by ananyapatharidav | 06 Feb, 2024, 06:51: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by artikumari118 | 05 Feb, 2024, 10:45: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Biology
1+1
question image
Asked by sathishkumar.sk6680 | 26 Jan, 2024, 09:35: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×