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Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this trait. If the stem characteristics are determined by a single gene, what is the expected outcome of crossing two tomato plants that are heterozygous for hairy stems?

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coronna05

hh recessive hairy

cross 2 heterozygous Hh

H h

H HH Hh

h Hh hh-hairy

chances are higher that it will not be hairy

luisvaschetto

The expected outcome of crossing two tomato plants that are heterozygous for hairy stems is observing a phenotypic proportion of 3:1 plants (3 hair stem plants: 1 hairless stem plant).

What is dominance?

Dominance in genetics is a phenomenon where the dominant alleles mask the recessive allele in heterozygous individuals.

  • Heterozygous individuals carry two different alleles for a given gene locus.

  • Homo-zygous individuals carry the same allele or gene variant for a given gene locus.

In conclusion, the expected outcome of crossing two tomato plants that are heterozygous for hairy stems is observing a phenotypic proportion of 3:1 plants (3 hair stem plants: 1 hairless stem plants).

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