Question

How is it possible that two tall plants could have a short offspring

Answer 1

Mendel found that short
strains of peas when bred together always produced short offspring. He also found that
some strains of tall plants when bred together always produced tall offspring and that
other strains of identically appearing tall plants when bred together produce 75% tall and
25% short offspring. The short plants were determined to be homozygous for a recessive
allele for “shortness” and therefore each parent could only donate one of these recessive
short alleles and therefore all offspring were also heterozygous for short. The first strain
of tall plants was also heterozygous, but in this instance for the dominant trait of
“tallness” and therefore each parent could only donate an allele for tall and so the
offspring could only be tall. The other tall strain however produced a mixture of tall and
short plants. Since shortness is the recessive trait in this instance, Mendel realized that
these short offspring must be homozygous for shortness (tt). Since one allele comes from
each parent, then each of the tall parents that produced these short plants must be carrying
one recessive gene for shortness. He also deduced that each parent must be carrying one
dominant gene for tallness, which made them appear the same as the homozygous tall
plants (TT). Therefore this particular strain of tall appearing plants had to be
heterozygous (Tt). Being dominant, the one tall (T) gene made the parent plant appear
indistinguishable from those with two tall genes. Mendel also crossed the truebreeding
tall strain with the truebreeding short strain and the first generation (F1) were 100% tall
plants. He hypothesized that these tall plants were all heterozygous (Tt). He proved this
by breeding the F1 tall plants together and getting 75% tall and 25% short plants.

Answer 2

thx soo much

Answer 3

no probs

Answer 4

well two tall plants can produce short offspring but only some for example pea plants always produce short offspring

Answer 5

This is why two tall plants can produce short offspring