How would you perform a reciprocal cross for the characteristic of stem height in the garden pea? Two sets of P0 parents would be used. In the first cross, pollen would be transferred from a true-breeding tall plant to the stigma of a true-breeding dwarf plant.
What is the reason why garden pea was an excellent choice of model system for studying inheritance?
One of the reasons that the garden pea was an excellent choice of model systems for studying inheritance is that the flowers close tightly during self-pollination to prevent accidental or unintentional fertilizations that could have diminished the accuracy of Mendel’s data.
When two true-breeding pea plants that show contrasting traits are crossed?
monohybrid cross
When fertilization occurs between two true-breeding parents that differ in only one characteristic, the process is called a monohybrid cross, and the resulting offspring are monohybrids. Mendel performed seven monohybrid crosses involving contrasting traits for each characteristic.
How would you determine if a plant is a true-breeding plant what would be the expected result?
A true-breeding plant is one that, when self-fertilized, only produces offspring with the same traits. True-breeding organisms are genetically identical and have identical alleles for specified traits. The alleles for these type of organisms are homozygous.
When pure breeding yellow seed and green seed pea plants are crossed what is the dominant to recessive ratio in the F2 generation?
The phenotypic ratio for F2 generations in a dihybrid cross between purebred round yellow seed pea plants and wrinkled green seed pea plants is 9:3:3:1.
When Gregor Mendel crossed a tall plant with a short plant the F1 plants inherited?
Multiply choice
| Question | Answer |
|---|---|
| When Gregor Mendel crossed a tall plant with a short plant, the F1 plants inherited | an allele for tallness from the tall parent and an allele for shortness from the short parent |
| The principle pf dominance states that | some alleles are dominant and others are recessive |
What special precautions should be taken in the crosses and in growing the plants?
The special precautions that should be taken in the crosses and in growing the plants are:
- The flower petals should remain sealed tightly until after pollination, preventing pollination from other plants. This will result in highly inbred, or true-breeding pea plants.
- Only true-breading pea plant are used.
- The plants…
What happens when pea plants showing two different characteristics?
When pea plants with round and green seeds are crossed with wrinkled and yellow seed (both pure line), FI generation plants have round and yellow seed.
What were the characteristics of the two pea plants that he crossed first?
First, he generated plants that were purebred for two characteristics, such as seed color (yellow and green) and seed shape (round and wrinkled). These plants would serve as the P1 generation for the experiment.
When two heterozygous tall pea plants are crossed what would the expected?
Biology Genetics Review
| Question | Answer |
|---|---|
| When two heterozygous tall pea plants are crossed, the expected genotype ratio of the offspring is _________________________. | 1:2:1 |
| An organism’s gametes have ____________________ the number of chromosomes found in the organism’s body cells. | half |
What is a reciprocal cross in genetics?
Reciprocal cross is a kind of crossing strategy, which means to make crosses between a pair of parents (A and B) by using them in turn as female parent and male parent to obtain two reciprocal crosses of A × B and B × A (usually a cross is expressed in the way that the first parent is female and the second parent is
How do you design an experiment to test for true-breeding plants?
To test for true-breeding plants we will have to chose a plant of specific color and look, for example purple tulip and then follow it through several generations to see if the color and looks are being inherited. If they are, then it is a true-breeding plant.
Why is true-breeding useful when performing genetic crosses?
True breeding lines are useful, because they are typically assumed to be homozygous for the alleles that affect the trait of interest. When two individuals that are homozygous for the same alleles are crossed, all of their offspring will all also be homozygous.
When Round and yellow RRyy is crossed with wrinkled and green RRyy What are phenotypes and phenotypic ratio?
So, the correct option is ‘9:3:3:1’.
Why were all of the peas yellow when Mendel crossed a purebred green plant with a purebred yellow plant?
I crossed pure-bred green with pure-bred yellow peas. Since yellow is dominant to green, all of the offspring were yellow. The green phenotype had disappeared.
What will happen when round green and wrinkled yellow peas are crossed with each other?
Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F1 progeny that have round, yellow (RrYy) seeds.
What happened when Mendel crossed two varieties of a character such as Tall & Short in pea?
When Mendel crossed two varieties of a character (such as tall and short) in pea plant, only the dominant trait (tall) appeared in F1 generation. The genetic constitution of F1 plants was Tt.
Why are the plants always tall when a tall pea plant is crossed with a short pea plant?
Answer: When a tall pea plant is crossed with a short pea plant, the resultant progeny is always tall because tall is dominant trait and short is recessive trait. Therefore, dominant trait expresses itself in the progeny.
When a tall and dwarf pea plant were crossed F1 showed only tall plants but in F2 generation some plants were dwarf what does it mean?
Dwarf plants were not found in F1 generation, but appeared in F2 generation. This occurred due to dominance of allele responsible for tallness. The recessive alleles are expressed only in homozygous condition/similar alleles in pair (tt).
What strategies can be used to ensure cross-pollination?
Plants have evolved many intricate methods for attracting pollinators. These methods include visual cues, scent, food, mimicry, and entrapment.
How do you cross grow plants?
Cross-pollinate your plants.
Gather the pollen from the stamen of the male plant using a q-tip or cotton ball. Brush the pollen onto the female plant’s pistil. To prevent extra cross-pollination, cover your female plant in plastic or a transparent bag.