The phenotypic ratio of heterozygous plants (pptt x pptt) in the f1 generation is 1:1:1:1.
<h3>Briefing :</h3>
P and T are dominant alleles p and t are recessive alleles
Parents: PpTt, pptt
Possible gametes are PT, Pt, pT, pt
where
pt (all the small) i.e white small
pT white tall
PT (all the big) i.e purple tall
Pt purple small
<h3>What is alleles?</h3>
Leading textbooks on genetics and evolution define an allele as a variant of the same sequence of nucleotides at the same location on a long DNA molecule. "The chromosomal or genomic location of a gene or any other genetic element is called a locus, and alternative DNA sequences at a locus are called alleles.
Alleles are the various variations of a gene. Alleles can be recessive or dominant. Even if a person only possesses one copy of a dominant allele, it still has an impact (also known as being heterozygous).
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I understand the question that you are looking for :
In garden peas, purple flowers (P) are dominant to white (p) flowers, and tall plants (T) are dominant to short plants (t). If a purple tall plant (PpTt) is crossed with a white short plant (pptt), what is the resulting phenotypic ratio?
A. 1:1:1:1 purple tall to purple short to white tall to white short,
B. 3:2 purple tall to purple short,
C. 9:3:3:1 purple tall to purple short to white tall to white short,
D. all purple tall.
