In Lathyrus odoratus,a hybrid blue-flowered a | vedclass

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(C) In $Lathyrus$ $odoratus$ (Sweet pea),the genes for flower color ($B$ for blue,$b$ for red) and pollen shape ($L$ for long,$l$ for round) show link

Vedclass · Accepted Answer

$87.4$

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(C) In $Lathyrus$ $odoratus$ (Sweet pea),the genes for flower color ($B$ for blue,$b$ for red) and pollen shape ($L$ for long,$l$ for round) show linkage.In the $cis$ arrangement,the dominant alleles are on one chromosome $(BL)$ and recessive alleles are on the other $(bl)$.The test cross is $BbLl 	imes bbll$.The parental combinations (non-recombinants) are $BL$ and $bl$,while the recombinant types are $Bl$ and $bL$.Based on the linkage data for this cross,the ratio of offspring is $7$ (Blue-Long) : $1$ (Blue-Round) : $1$ (Red-Long) : $7$ (Red-Round).The parental types are Blue-Long $(BbLl)$ and Red-Round $(bbll)$,which account for $7 + 7 = 14$ out of $16$ total offspring.Percentage of parental types = $(14 / 16) 	imes 100 = 87.4\%$.

In $Lathyrus$ $odoratus$,a hybrid blue-flowered and long-pollen plant is test-crossed with a homozygous recessive red-flowered and round-pollen plant. How many parental types are obtained when genes are present in the $cis$ stage in parents (in $\%$)?

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