When a tall and short plant are crossed, all of the offspring are tall . If the offspring self-fertilize, they produce tall and short plants in a ratio of 3:1 in the next generation.
When you cross a tall pea plant with a short pea plant?
The “TT” and “Tt” crosses both have at least one “T” allele, so they are tall plants. However, the last cross “tt” doesn’t have any “T” alleles and is short, because it is homozygous recessive . Since 1 out of 4 pea plants are short, or 1/4, the probability of a short pea plant from a heterozygous cross is 25%.
What kind of offspring will a homozygous tall pea plant and a homozygous short pea plant make?
Correct answer:
Explanation: When a homozygous tall pea plant and a homozygous short pea plant are crossed, the next generation are all heterozygous and the dominant allele is expressed in all the plants, and the recessive trait seems to disappear.
Is a tall pea plant homozygous or heterozygous?
Dwarf plant is always homozygous (tt) as tallness is dominant allele and the dwarfness is recessive allele in pea. It produces gametes with ‘t’ allele only. All the gametes produced by tall plant will be only of one type carrying ‘T’ allele if it is homozygous tall (TT). and thus all the offsprings will be tall (Tt).
Is short or tall dominant in pea plants?
In pea plants, tall alleles (T) are dominant and short alleles (t) are recessive.
What is the genotype for a short pea plant?
The answer is c. tt .
When two heterozygous tall pea plants are crossed what would the expected?
| 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 |
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What would happen if a homozygous tall pea plant and a homozygous short pea plant crossed?
Explanation: When a homozygous tall pea plant and a homozygous short pea plant are crossed, the next generation are all heterozygous and the dominant allele is expressed in all the plants, and the recessive trait seems to disappear .
What is the genotype of a homozygous short pea plant?
A homozygous short pea plant will have the genotype tt .
How would geneticists represent the genotype of a homozygous tall pea plant?
For example, in pea plants, height is governed by a single gene with two alleles, in which the tall allele (T) is dominant and the short allele (t) is recessive. A true-breeding tall pea plant would have the genotype with two dominant alleles , usually represented as TT .
How would you determine the genotype of a tall pea plant?
To know the genotype of the plant, a test cross is performed . In the test cross, pea plant showing the dominant phenotype is crossed with the pea plant that is homozygous recessive for the same trait. Results of the test cross are then interpreted to know the exact genotype of the given plant.
What is the genotype for the tall plant?
Genotypes for plant height are TT, Tt, tt . Genotypes can be heterozygous or homozygous. Phenotypes for plant height are tall or short. TT and Tt genotypes both expressed the tall phenotype because the T is dominant to t.
What law of inheritance was involved if a tall pea plant crossed with a short pea plant produced all tall offspring?
When a tall and short plant are crossed, all of the offspring are tall. If the offspring self-fertilize, they produce tall and short plants in a ratio of 3:1 in the next generation. Mendel’s actual counts were 787 tall:277 short plants in this generation (2.84:1 ratio).
Is tall height dominant or recessive?
A pea plant could have a copy of the height gene that coded for “tall” and a copy of the same gene that coded for “short.” But the tall allele is “dominant ,” meaning that a tall-short allele combination would result in a tall plant.
What makes one pea plant tall and one pea plant short?
The trait of height for a pea plant is determined by two genes , one from each parent. Each trait of an organism is determined by at least one gene from each parent. Homozygous Plants Mendel found that one kind of pea plant always had tall offspring. ... These plants have two short genes.
What will be the offspring if we cross a purebred tall plant with a purebred short plant?
For instance, purebred tall plants were crossed with purebred short plants. Mendel observed that all of the offspring grew to be tall plants. None resembled the short short parent. He called this generation of offspring the first filial , or F1 generation, (The word filial means “son” in Latin.)
What would be the genotypic ratio of F2 generation when a tall plant is crossed with short plant *?
So, the correct option is ‘ 1:2:1 ‘.
What happens when cross 2 heterozygous?
The expected genotype ratio when two heterozygotes are crossed is 1 (homozygous dominant) : 2 (heterozygous) : 1 (homozygous recessive). ... Individuals homozygous for the lethal allele (tt in this case) do not survive embryonic development , and are not born. The heterozygotes have a phenotype distinct from normal cats.
Which of the following is Monohybrid cross?
Give an example of a monohybrid cross.
Breeding a long-stemmed pea plant with a short-stemmed pea plant is an example of a monohybrid cross. A cross between the two creates heterozygous offspring.
What is the ratio of hybrid tall to pure tall plants in F2 progeny?
In the F2 generation, the tall and dwarf plants will be produced in 3 : 1 ratio . Out of the three tall plants, one tall plant will be homozygous tall (TT) and two tall plants will be heterozygous tall (Tt).
What happens when two homozygous plants are crossed?
Complete dominance occurs when the heterozygote phenotype is indistinguishable from that of the homozygous parent. ... Thus, when homozygous red flowers (A1A1) are crossed with homozygous white (A2A2), a variety of pink-shaded phenotypes result.
When two heterozygotes are crossed what percentage of the offspring are also heterozygotes?
Homozygous dominant: 25% or 0.25. Heterozygous: 50% or 0.50. 11. If two heterozygotes are crossed, the probability that an offspring will show the dominant trait is 75% or 0.75 .
When a plant homozygous for tall is crossed with a plant homozygous for dwarf what will be the appearance of the offspring of a cross of f1 with its tall parent?
ANSWER: The condition given is that a plant (Homozygous tall) is crossed with a plant (Homozygous dwarf), then the appearance of the plats or saplings at the F1 generation would be all tall plants .
Why is the progeny always tall when a homozygous tall pea plant is crossed with a short pea plant?
a) The cross between tall and short pea plant produces the tall progeny. The tall progeny is present in heterozygous condition and the tall trait is dominant that expresses itself and suppresses the expression of the short trait.
What is the ratio obtained when heterozygous tall pea plant is crossed with homozygous tall pea plant?
gneotype of paren... Monohybrid cross produced both tall and dwarf Pea plants in the ratio of 3:1 .
What is the genotype of the heterozygote?
Listen to pronunciation. (HEH-teh-roh-ZY-gus JEE-noh-tipe) The presence of two different alleles at a particular gene locus. A heterozygous genotype may include one normal allele and one mutated allele or two different mutated alleles (compound heterozygote).
What is the genotype of a homozygous black guinea pig?
To begin, use the alleles to determine the genotypes of each parent: homozygous black guinea pig: BB . homozygous white guinea pig: bb.
Can short pea plants be heterozygous?
Could a short pea plant be heterozygous? No , if it is heterozygous that means it has one tall gene. The tall gene will always be dominant-and show itself-(the plant will be tall.) One pea plant is homozygous for yellow seeds.
What is assortment law?
Mendel’s law of independent assortment states that the alleles of two (or more) different genes get sorted into gametes independently of one another . In other words, the allele a gamete receives for one gene does not influence the allele received for another gene.
What is the homozygous dominant genotype?
An organism with two dominant alleles for a trait is said to have a homozygous dominant genotype. Using the eye color example, this genotype is written BB . An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype.
How do you determine if a tall plant is heterozygous or homozygous?
Homozygous plants have two identical copies of a single gene. Heterozygous plants have two copies of a single gene, but those copies are alleles, or different versions of that gene. The second type is heterozygous. Plants that are heterozygous for a particular gene have one copy each of two different alleles, ‘Aa’.
What is Mendelian law of inheritance?
Gregor Mendel, through his work on pea plants, discovered the fundamental laws of inheritance. He deduced that genes come in pairs and are inherited as distinct units, one from each parent . ... Offspring therefore inherit one genetic allele from each parent when sex cells unite in fertilization.
What is dominance law?
The law of dominance states that one of the pairs of inherited traits will be dominant and the others recessive unless both the factors are recessive .
How do you determine a plants genotype?
We can determine the genotype of the plant by observing the phenotypes of the offsprings resulting from test cross .
What is the genotype of plant A?
The genotype of a plant is a word used describes the genetic make – up of the plant . The context that it is used depends upon whether it is being used to describe the whole genome, the DNA sequence of individual genes or a collection of scores at different genetic markers.
How would you find genotype of a tall pea plant bearing violet flowers?
All tall and violet, then genotype of parent is TTWW . Phenotypic ratio: 3 : 1 (3 tall violet : 1 tall white) then Parent is TTWw. If phenotypic ratio 9 : 3 : 3 : 1, then parent is TtWw.
What do a tall pea plant TT and tall pea plant TT have in common?
The “TT” and “Tt” crosses both have at least one “T” allele , so they are tall plants. However, the last cross “tt” doesn’t have any “T” alleles and is short, because it is homozygous recessive . Since 1 out of 4 pea plants are short, or 1/4, the probability of a short pea plant from a heterozygous cross is 25%.
What is the phenotype of a tall pea plant?
| Genotype Definition Example | Homozygous Two of the same allele TT or tt | Heterozygous One dominant allele and one recessive allele Tt |
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What genotype represents a plant with short stems?
The genotype for height of the stems is Tt , which is heterozygous, containing a dominant and recessive allele. Since the allele for tall height is dominant, the tall stems phenotype will be expressed.
What determines how tall you will be?
Genetics are among the prominent factors that contribute to how tall you’ll be. As a general rule of thumb, your height can be predicted based on how tall your parents are . If they are tall or short, then your own height is said to end up somewhere based on the average heights between your two parents.
What determines height?
The main factor that influences a person’s height is their genetic makeup, or DNA . However, many other factors can influence height during development, including nutrition, hormones, and medical conditions. Scientists believe that DNA is responsible for about 80% of a person’s height.
Which chromosome determines height?
A person’s height depends on both genetic and environmental influences. Previous studies have identified the aromatase gene and the Y chromosome gene as height genes in men who are very tall or very short, but the Melbourne study shows they also help determine normal adult height in the general population.
