Mendel wanted to know what happened to the white-flowers. If indeed a “heritable factor” for white-flower had disappeared,
all future offspring of the hybrids would be purple-flowered – none would be white
. To test this idea, Mendel let the F
1
generation plants self-pollinate and then planted the resulting seeds.
What happened to the traits that did not appear in the F1 generation?
The trait not shown in the F1
reappeared in the F2 in about 25% of the offspring
. Traits remained unchanged when passed to offspring: they did not blend in any offspring but behaved as separate units. Reciprocal crosses showed each parent made an equal contribution to the offspring.
Why did the white flower color disappear in the F1 generation quizlet?
In Mendel’s initial experiments, white flowers disappeared
after the first paternal crosses
. Different alleles account for much of the variation in the characteristics of organisms. Mendel showed that factors controlling different characteristics, such as pod color.
What were Mendel’s results when he crossed the F1 generation of flowers?
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 could be the explanation why a trait that disappeared in the F1 generation reappeared in the F2 generation?
Mendel termed the traits that always appeared in the F1 generation dominant traits because
they masked, or dominated, the traits that did not show up at all
. Mendel let the pea plants self-pollinate to produce the F2 generation. The traits absent from F1 were present in some plants of the F2 generation.
What was the outcome of the F1 generation in Mendel’s first experiment quizlet?
The F1 generation results from
cross-pollination of two parent plants contained all purple flowers
. The F2 generation results from self-pollination of F1 plants, and contained 75% purple flowers and 25% white flowers. To test this prediction, Mendel allowed the F1 generation plants to self-pollinate.
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).
What trait will appear in the F1 generation?
Basically, if you have a parent with completely dominant genes and traits and cross them with another parent that displays recessive traits and has recessive genes, the F1 generation will display
the dominant trait only
.
What is difference between F1 and F2 generation?
F1 generation refers to the first filial generation of the offspring from the parents, while F2 generation is
the second filial generation
of the offspring, generated through inbreeding of F1 individuals.
What are the 3 principles of Mendelian genetics explain the 3 principles in details with examples?
The key principles of Mendelian inheritance are summed up by Mendel’s three laws:
the Law of Independent Assortment, Law of Dominance, and Law of Segregation
.
What was Mendel’s first conclusion?
Character Traits Exist in Pairs that Segregate at Meiosis
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 is a F1 generation?
The term “F1” means the “
first filial generation
,” or the initial cross between two genetically distinct plants. Often an F1 cross does not yield the desired goals because some traits do not show up in those first generation seedlings.
What is the P generation?
The
parental generation
refers to the first set of parents crossed. The parents’ genotype would be used as the basis for predicting the genotype of their offspring, which in turn, may be crossed (filial generation). … These two plants comprise the parental generation (P generation).
What did Mendel call the factor for white flower color?
Traits such as the yellow-seed colour and the purple-flower colour Mendel called dominant; the green-seed colour and the white-flower colour he called
recessive
.
How a trait might seem to disappear for a generation and then reappear in the following generation?
Recessive traits
often seem to disappear because two recessive alleles are needed to produce the recessive phenotype. They can skip a generation and then reappear if an individual inherits two copies of the recessive gene.
What happens to alleles between the P and F1 generations?
The alleles in the P generation
passes on its dominant and recessive alleles
, causing the F1 plants to both be tall. The F1 alleles then passed on its alleles in which a fourth of them were recessive, causing one of the three plants in F2 to be short.
