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 Main Idea- Monohybrid cross involves one triat

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PostSubject: Main Idea- Monohybrid cross involves one triat   06/12/08, 05:18 pm

monohybrid crosses- crosses that examine the inheritance of only one specific trait.

test cross- a cross between an organism with an unknown genotype and an organism with the recessive phenotype

Homozygous-Homozygous
-If a pea plant that is homozygous dominant and a plant that is homozygous recessive (FF and ff) are crossed, 100% of the offspring will have the heterozygous genotype, Ff.

F F
f FfFf
fFfFf


Heterozyous- Heterozygous
- If both pea plants are purple, but have a recessive gene for white, one forth of the offspring will have a homozygous dominate genotype, FF. Half will have the heterozygous geneotype, Ff. One-fourth will have the homozygous recessive geneotype, ff.

F f
F Ff Ff
fFf ff


Heterozygous-Homozygous
- If you cross a pea plant that is heterozygous for purple flowers (Ff) with a plant that is homozygous recessive for white flowers (ff), half of the offspring will be heterozygous, and half will be homozygous recessive.

f f
FFf Ff
f ffff


- If you didn't know the genotype of the purple flower, you can do a test cross. The purple flower would be crossed with a white, homozygous dominant plant. If the offspring are white, the genotype of the purple flower is Ff. If all the flowers are purple, the genotype of the purple flower is FF.

Purple flower is either PP or Pp.

cross- Purple flower x pp
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