Question

draw the checker board of f1 generation
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Answer 1

Hey mate!!

Here's the answer

Ans.- An F1 hybrid (or filial 1 hybrid) is the first filial generation of offspring of distinctly different parental types. F1 hybrids are used in genetics, and in selective breeding, where it may appear as F1 crossbreed.

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Answer 2

In monohybrid cross in F1 generation when parents are homozygous the genotype and phenotype ratio is same. When parents are heterozygous the phenotype ratio is 3:1 and genotype ratio 1:2:1.

In dihybrid cross when parents are homozygous both phenotype and genotype ratio is 4:0, when parents are heterozygous phenotype ratio is 3:1, genotype ratio is 1:2:1

Explanation:

The F1 generation is the offspring produced in controlled generation by parental cross. This is called First filial generation.

The checker board  is used to see the possible combination of gamete formed by crossing parental gametes.

The checker board for monohybrid cross.

The tall and short parents are crossed:(tall TT and short tt homozygous)

    T    T

t   Tt    Tt

t   Tt    Tt       All the four offspring will be tall heterozygous.

Genotype and phenotype ratio is same i.e 4:0

When heterozygous parents are crossed. Tt and Tt

    T     t

T  TT  Tt

t  Tt   tt       genotype ratio 1:2:1,  phenotype ratio 3:1

When there are two traits involved or two gametes is dihybrid cross:

TTRR and ttrr  (tall and short , red and yellow colour flower where red is dominant to yellow)

gametes are TR TR tr tr  ( homozygous)

punnet square:

   TR    TR

tr  TRtr  TtRr

tr  TtRr   TtRr     phenotype ratio 4:0 genotype ratio 4:0

In case of heterozygous parents the checker board is

   TtRr  and TtRr

    TR        tr

TR TTRR  TtRr      phenotype ratio is 3:1, genotype ratio is 1:2:1

tr    TtRr   ttrr

genotype ratio 1:2:1

phenotype ratio is 3:1

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