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A recessive trait reappears in the 2nd generation. The classic example of this would be Gregor Mendel's pea plant cross. He took 2 pea plants, one short and one tall, cut out some of their reproductive parts so they couldn't self pollinate, and crossed their pollen. However, instead of getting a medium sized plant, he got 4 tall plants. This generation is the first, or F1, generation. Where did the short trait go? Did it simply disappear? Or was it being masked? To find out, he let the F1 generation self-pollinate. Surprisingly, there were 3 tall and 1 short plants in the F2 generation. Although the short trait was recessive, it reappeared in the second generation.
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Which type of genetic trait appears in every generation of offspring?
the dominant trait
What is the phenotype in the F1 generation that disappears in a one trait test cross?
The recessive trait phenotype disappears in a one-trait test cross in the F1 generation. This phenotype can reappear in the F2 generation.
What is law of dominance and how do traits manifest if it is from a parent with this type of trait?
Mendel's law of dominance states that when two pure breeding organisms of contrasting traits (such as purple flower or white flower) are crossed, only one trait of the pair appears in the F1 generation. This is known as the dominant trait (purple), and the other unexpressed trait (white) is recessive.
How does a genetic trait appear every generation and what is it considered?
A trait like this must be homozygous dominate.
What was the main experiments Gregor Mendel carried out?
In mendels first experiments, he crossed pea plants to study seven different characteristics. For example he crossed plants that had purple flowers with plants that had whit flowers, the offsprings from such a cross are called first- generation plants. All of his first generation plants had purple flowers. One trait was always present in the first generation , and the other trait seemed to disappear. Mendel chose to call the trait that appeared the dominant trait. Because the other trait seemed to fade into the background, Mendel called it recessive trait.
A trait that appears or is expressed in the f1 generation is what?
the dominant trait
Which type of genetic trait appears in every generation of offspring?
the dominant trait
Will there be a second generation for the nook?
recessive trait
In mendels experiment a trait that always disappeared in the f1 generation but reappeared in the f2 generation was called the?
recessive trait
A trait which always appears when it is present is called what kind of trait?
It is called a dominant trait
When studying a pedigree how do scientists determine if a trait is dominate or recessive?
dominant only appears in the F1 generation as 4 recessive stays hidden or masked in the F1 generation
What did Mendel do in his second law?
The second Mendelian Law is the Law of Segregation. It states that in a cross the parental traits do not merge in the first offspring generation (ie. the recessive, "weaker" trait does not disappear for good) but instead appear unchanged in the second offspring generation. For example, if you cross homozygous dwarf pea plants to homozygous tall, all members of the first offspring generation will be tall. This makes it seem as if the dwarf trait disappears, but it does not. If you inbreed the first offspring generation, you get 25% dwarf plants in the second offspring generation. So the "lost" trait reappears.
What kind of trait always appears in the offspring produced in Mendels first experiment?
Dominant
The observed trait in the first generation?
Dominant trait
If the F2 generation expressed a trait in a 3.1 ratio the F1 generation MUST be heterozyous for that trait?
True
What is the phenotype in the F1 generation that disappears in a one trait test cross?
The recessive trait phenotype disappears in a one-trait test cross in the F1 generation. This phenotype can reappear in the F2 generation.
What is a trait that reappears in the second after disappearing in the first generation?
A recessive trait reappears in the 2nd generation. The classic example of this would be Gregor Mendel's pea plant cross. He took 2 pea plants, one short and one tall, cut out some of their reproductive parts so they couldn't self pollinate, and crossed their pollen. However, instead of getting a medium sized plant, he got 4 tall plants. This generation is the first, or F1, generation. Where did the short trait go? Did it simply disappear? Or was it being masked? To find out, he let the F1 generation self-pollinate. Surprisingly, there were 3 tall and 1 short plants in the F2 generation. Although the short trait was recessive, it reappeared in the second generation.
