Two pea plants, both heterozygous for flower color, are crossed. The offspring will show the dominant purple coloration in a 3:1 ratio. Or, about
75% of
the offspring will be purple.
What percentage of F1 offspring is purple?
The F1 generation is
100% Pp
. The F2 generation is 25% PP (homozygous dominant, purple flowers), 50% Pp (heterozygous, purple flowers), and 25% pp (homozygous recessive, white flowers). This is how the white characteristic reappears in the second generation.
Why were all the offspring in the F1 generation purple?
From AG: Q1 = The two flowers that he crossed in his original experiment were a homozygous dominant and a homozygous recessive. Because of this each of the offspring in the F1 generation were
all heterozygous
making them purple.
What is the probability the flower will be purple?
Checking the probability of fusion between the gametes produced by two plants crossed using Punnet Square
Why did Mendel see a 3 1 ratio of purple to white flowers in the F2 cross?
There was a 3:1 ratio of purple:white flowers in generation F2
because the “masked” (recessive) genes from the F1 generation were allowed to pair
, however they were only allowed to pair one time leaving the other three times to appear with purple flowers.
What was Mendel’s first conclusion?
This is the basis of Mendel’s First Law, also called The
Law of Equal Segregation
, which states: during gamete formation, the two alleles at a gene locus segregate from each other; each gamete has an equal probability of containing either allele.
What does the letter F stand for in F1 generation?
: the first generation produced by a cross and consisting of individuals heterozygous for characters in which the parents differ and are homozygous. — called also
first filial generation
.
Which flower color is dominant purple or white?
| A B | Purple flower color is dominant to white flowers in pea plants. What is the genotype of a Purple Parent if the phenotypic ratio of the offspring is 50% Purple and 50% White. Hint – do a test cross. Pp |
|---|
Which is dominant purple or white flowers?
These are the parental generation. Their offspring—the first filial, or F1, generation—each receive one purple allele and one white allele. Since all of the offspring have the purple phenotype, this tells us that
the purple allele is dominant to the white allele
.
Can two plants with white flowers produce offspring with purple flowers?
Crossing a plant with white flowers and a plant that is homozygous for purple flowers results in offspring with what color combinations? … Can two plants with purple flowers produce offspring with white flowers?
Yes
, if both parents are heterozygous for the trait. You just studied 36 terms!
Is PP genotype or phenotype?
A simple example to illustrate genotype as distinct from phenotype is the flower colour in pea plants (see Gregor Mendel). There are three available genotypes, PP (
homozygous dominant
), Pp (heterozygous), and pp (homozygous recessive).
When crossing two parents the F1 generation were all what?
The F1 generation results from cross-pollination of two parent (P) plants, and contained
all purple flowers
. The F2 generation results from self-pollination of F1 plants, and contained 75% purple flowers and 25% white flowers. This type of experiment is known as a monohybrid cross.
What are the three steps of Mendel’s experiments?
| P w | P PP Pw | w Pw ww |
|---|
What was Mendel’s third conclusion?
What was Mendel’s third conclusion?
The dominant allele
What is Mendel’s 2nd law?
Mendel’s Second Law –
the law of independent assortment
; during gamete formation the segregation of the alleles of one allelic pair is independent of the segregation of the alleles of another allelic pair.
What was Mendel’s second conclusion?
In what is now known as Mendel’s second law, he concluded
that different gene pairs assort independently in gamete formation
. With hindsight about the chromosomal location of genes, we now know that this “law” is true only in some cases. Most cases of independence are observed for genes on different chromosome.
