6.1 Reproduction

6.1 Reproduction

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Question 7

80%

Resistance to Tobacco Mosaic Virus (TMV) in tomato plants is controlled by a single gene with two alleles:

$T\,$ is the dominant allele for resistance to TMV.
$t\,$ is the recessive allele for susceptibility (non-resistance) to TMV.

A gardener crosses a heterozygous resistant tomato plant ( $T t$ ) with a susceptible tomato plant ( $tt$ ).

The Punnett square below shows the gametes of the parents:

	Female gamete: $t$	Female gamete: $t$
Male gamete: $T$
Male gamete: $t$

What percentage of the offspring are expected to be resistant to TMV?

$t$

$50%50\%$

$75%75\%$

$25%25\%$