What are the genotypes of offspring from an FF ff cross?

Human Anatomy & Physiology (11th Edition)
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ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
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What are the genotypes of offspring from a FF ff cross?

MONOHYBRID CROSSES
All offspring receive a dominant
allele, F, from one parent and a
recessive allele, f, from the other
parent. So all offspring-100
percent-have the heterozygous
genotype Ff. And 100 percent of
offspring have purple flowers.
From each parent, half of the
offspring receive a dominant al-
lele, F, and half receive a recessive
allele, f. Therefore, one-fourth of
the offspring have an FF genotype,
one-half are Ff, and one-fourth are
ff. In other words, the genotypic
ratio is 1:2:1 of FF:Ff:ff. Remember
that both FF and Ff genotypes have
a purple phenotype. The phenotypic
ratio is 3:1 of purple:white flowers.
All of the offspring receive a
recessive allele, f, from the homo-
zygous recessive parent. Half
receive a dominant allele, F, from
the heterozygous parent, and half
receive the recessive allele, f. The
resulting genotypic ratio is 1:1 of
Ff:ff. The phenotypic ratio is 1:1 of
purple:white.
homozygous
recessive parent
INSTANT
REPLAY
heterozygous
parent (Ff)
heterozygous
parent (Ff)
F
F
f
F
Ff
Ff
F
FF
Ff
f
Ff
ff
s
homozygous
dominant parent (FF)
F
Ff
Ff
heterozygous
parent (Ff)
f
Ff
ff
homozygous
recessive parent (ff)
Ff
ff
Suppose that we had a purple-flowered pea plant but did not know its
genotype. It could be FF or Ff. We could figure out its genotype by cross-
ing the purple-flowered plant with a white-flowered plant. We know that
the white-flowered plant is ff, because it has the recessive phenotype. If the
purple-flowered plant is FF, the offspring will all be purple. If the purple-
flowered plant is Ff, half of the offspring will have purple flowers, and half
will have white flowers. Crossing a homozygous recessive organism with
an organism of unknown genotype is called a testcross.
What are the genotypes of offspring from an FF ff cross?
Transcribed Image Text:MONOHYBRID CROSSES All offspring receive a dominant allele, F, from one parent and a recessive allele, f, from the other parent. So all offspring-100 percent-have the heterozygous genotype Ff. And 100 percent of offspring have purple flowers. From each parent, half of the offspring receive a dominant al- lele, F, and half receive a recessive allele, f. Therefore, one-fourth of the offspring have an FF genotype, one-half are Ff, and one-fourth are ff. In other words, the genotypic ratio is 1:2:1 of FF:Ff:ff. Remember that both FF and Ff genotypes have a purple phenotype. The phenotypic ratio is 3:1 of purple:white flowers. All of the offspring receive a recessive allele, f, from the homo- zygous recessive parent. Half receive a dominant allele, F, from the heterozygous parent, and half receive the recessive allele, f. The resulting genotypic ratio is 1:1 of Ff:ff. The phenotypic ratio is 1:1 of purple:white. homozygous recessive parent INSTANT REPLAY heterozygous parent (Ff) heterozygous parent (Ff) F F f F Ff Ff F FF Ff f Ff ff s homozygous dominant parent (FF) F Ff Ff heterozygous parent (Ff) f Ff ff homozygous recessive parent (ff) Ff ff Suppose that we had a purple-flowered pea plant but did not know its genotype. It could be FF or Ff. We could figure out its genotype by cross- ing the purple-flowered plant with a white-flowered plant. We know that the white-flowered plant is ff, because it has the recessive phenotype. If the purple-flowered plant is FF, the offspring will all be purple. If the purple- flowered plant is Ff, half of the offspring will have purple flowers, and half will have white flowers. Crossing a homozygous recessive organism with an organism of unknown genotype is called a testcross. What are the genotypes of offspring from an FF ff cross?
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