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2021-06-17

What will happen if a purple-flower is crossed with a white flower?

What will happen if a purple-flower is crossed with a white flower?

Mendel concluded that pea traits like flower color were determined by separate units. From the results, Mendel proved that all traits do not blend. For instance, purple flowers mixed with white flowers did not produce pink flowers. Mendel concluded that traits like flower color must be determined by individual units.

Is PP white or purple?

the allele P (purple) is dominant. this means that if there are one or more alleles present in the genotype of the offspring (Pp or PP), the flower will be purple. the flower can only be white if there are two recessive genes – if the flower were white, the genotype would have to be pp.

What is the genotype PP?

A genotype is the actual genetic composition or makeup of an organism. Most genes are made up of two or more different alleles, or forms of a trait. A purple-flowered pea plant may have the genotype PP or Pp. A white-flowered pea plant would have the genotype pp.

What was the phenotype of offspring in F1 generation?

So, the F1 generation all have identical genotypes, heterozygous at the seed color gene, and their phenotypes are yellow seeds.

Why does new character appear in F2 generation of Dihybrid cross?

The reason for the appearance of new combinations in the F2 generation is given by the law of independent assortment. The law of independent assortment states that: When two pairs of traits are combined in a hybrid, one pair of character segregates independent of the other pair of character.

How many plants are Dihybrid in F2 generation of Dihybrid cross?

So the ratio of the dihybrid cross was found to be (9:3:3:1) and dihybrid plants are 4. Hence, the correct answer is option (C).

What will be the percentage of double heterozygous in Mendelian Dihybrid F2?

The ratio of number of kinds of double homozygous to double heterozygous to single homozygous genotypes of F2 generation of a mendelian dihybrid cross is 3:2:4.

What percentage of offspring would have the genotype AABbCc in F2 generation of a Trihybrid cross?

This discussion on What percentage of offsprings would have the genotype AABbCc in F2 generation of a trihybrid cross a 12.5% b 6.25% c 25% d 37.5%? is done on EduRev Study Group by NEET Students.

What is the percentage of double homozygous?

The ratio of double homozygous to double heterozygous to the homozygous genotype of the F2 generation of a mendelian dihybrid cross is 4:4:8.

What will happen if a purple flower is crossed with a white flower?

Mendel concluded that pea traits like flower color were determined by separate units. From the results, Mendel proved that all traits do not blend. For instance, purple flowers mixed with white flowers did not produce pink flowers. Mendel concluded that traits like flower color must be determined by individual units.

What plant has purple and white flowers?

Alliums

Can two plants with purple flowers produce offspring with white flowers?

Can two plants with purple flowers produce offspring with white flowers? Yes, if both parents are heterozygous for the trait.

What percentage of offspring are white flowers?

Predicting Offspring Phenotypes Only offspring with the bb genotype will have the white-flower phenotype. Therefore, in this cross, you would expect three out of four (75 percent) of the offspring to have purple flowers and one out of four (25 percent) to have white flowers.

Why does each parent contribute only one allele to the offspring?

Why does each parent contribute only one allele to the offspring? Because alleles are segregated during meiosis when homologous chromosomes are separated.

What is the percentage of offspring?

PARENT GENOTYPES OFFSPRING PHENOTYPES
pure (homozygous) dominant x anything 100% of offspring with dominant trait
hybrid x homozygous recessive 50% dominant trait, 50% recessive trait
hybrid x hybrid 75% with dominant trait & 25% with recessive trait
homozygous recessive x homozygous recessive 100% recessive trait

What percentage of the offspring will be heterozygous dominant?

In another example (shown below), if the parent plants both have heterozygous (YG) genotypes, there will be 25% YY, 50% YG, and 25% GG offspring on average. These percentages are determined based on the fact that each of the 4 offspring boxes in a Punnett square is 25% (1 out of 4).

What does it mean if you are heterozygous for a trait?

Heterozygous refers to having inherited different forms of a particular gene from each parent. A heterozygous genotype stands in contrast to a homozygous genotype, where an individual inherits identical forms of a particular gene from each parent.

What are the clinical issues associated with being heterozygous?

in heterozygotes has been reported together with signs of a slightly increased cerebral irritability, a possible slight increase of risk for mental disease, and an increase of blood phenylalanine levels in stress situations.

What disease is caused by a dominant allele?

Huntington’s disease is an inherited disorder that causes damage to certain brain cells. It is caused by a dominant allele .

Which type of mutation is likely to cause the least harm in an individual?

Point Mutations

Is Huntington disease caused by a dominant or recessive allele?

Huntington’s disease is an autosomal dominant disorder, which means that a person needs only one copy of the defective gene to develop the disorder. With the exception of genes on the sex chromosomes, a person inherits two copies of every gene — one copy from each parent.

Is Huntington’s disease more common in males or females?

Huntington’s disease is relatively uncommon. It affects people from all ethnic groups. The disease affects males and females equally.

What triggers Huntington disease?

Huntington’s disease is a progressive brain disorder caused by a single defective gene on chromosome 4 — one of the 23 human chromosomes that carry a person’s entire genetic code. This defect is “dominant,” meaning that anyone who inherits it from a parent with Huntington’s will eventually develop the disease.

What famous person has Huntington’s disease?

Like ALS, whose eponymous sufferer was baseball player Lou Gehrig, Huntington’s has a famous victim — the folk singer Woody Guthrie, who died in 1967. Both diseases proceed unabated once their symptoms appear.

What are the 5 stages of Huntington’s disease?

Stages of Disease Progression (Shoulson, 1981) and Alternate Stages of Huntington’s Disease (Pollard & Best, 1996)

  • Stage I: (0 to 8 years from illness onset)
  • Alternate Stage I: Defiance.
  • Alternate Stage II: Perseverance.
  • Stage III: (5 – 16 years from illness onset)
  • Alternate Stage III: Compassion.

Is Huntington’s painful?

Overall, 41.3% of the patients felt pain. Depending on the study, the prevalence of pain could range from 10% to 75%. Researchers noted that the proportion of patients affected by pain is comparable to other neurodegenerative diseases, such as Parkinson’s disease.

Who was the first person to have Huntington’s disease?

George Huntington (Figure 1) was the first person to provide a comprehensive description of adult-onset HD in 1872; he was only 22 years old at the time.

How do Huntington patients die?

Patients with Huntington’s disease usually die 15-20 years after the symptoms first appear. The cause of death usually is a complication of Huntington’s, such as pneumonia, heart failure, or infection.

What diseases are similar to Huntington’s disease?

Huntington’s Disease‐Like Syndromes

Condition Synonym Gene
Benign hereditary chorea Thyroid‐lung syndrome TITF1
Benign hereditary chorea, type 2
ADCY5‐associated chorea Familial dyskinesia with facial myokymia ADCY5
Primary familial brain calcification Idiopathic basal ganglia calcification, Fahr’s disease SLC20A2

What part of the body does Huntington’s disease affect?

Huntington’s disease is an inherited (genetic) condition that affects the brain and nervous system. It is a slowly progressive condition that interferes with the movements of your body, can affect your awareness, thinking and judgement and can lead to a change in your behaviour.