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wrote...
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12 years ago
purple stems genotype is ANL/ANL or ANL/anl
dark green leaves is YGR/YGR or YGR/ygr

what are the possible genotypic ratios of this cross?
and how do you do the cross?
pleaseeee help
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wrote...
12 years ago
There are FOUR possible dihybrid crosses between purple stemmed plants with dark green leaves:
1. ANLANLygrygr x anlanlYGRYGR (homozygote x homozygote)
2. ANLANLygrygr x anlanlYGRygr (homozygote x heterozygote)
3. ANLanlygrygr x anlanlYGRYGR (heterozygote x homozygote)
4. ANLanlygrygr x anlanlYGRygr (heterozygote x heterozygote)

Cross 1:
P: ANLANLygrygr x anlanlYGRYGR
Gamete: (ANLygr) x (anlYGR)
F1: All ANLanlYGRygr (purple stem, dark green leaves)

Cross 2:
P: ANLANLygrygr x anlanlYGRygr
Gametes: (ANLygr) x (anlYGR, anlygr)
F1: 1/2 ANLanlYGRygr (purple stem, dark green leaves) : 1 ANLanlygrygr (purple stem, normal leaves)

Cross 3:
P: ANLanlygrygr x anlanlYGRYGR
Gametes: (ANLygr, anlygr) x (anlYGR)
F1: 1/2 ANLanlYGRygr (purple stem, dark green leaves) : 1/2 anlanlYGRygr (normal stem, dark green leaves)

Cross 4:
P: ANLanlygrygr x anlanlYGRygr
Gametes: (ANLygr, anlygr) x (anlYGR, anlygr)
F1: 1/4 ANLanlYGRygr  (purple stem, dark green leaves) : 1/4 ANLanlygrygr (purple stem, normal leaves) : 1/4 anlanlYGRygr (normal stem, dark green leaves) : 1/4 anlanlygrygr (normal stem, normal leaves)
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