Table of Contents
- 1 What happens when a homozygous dominant is crossed with a homozygous recessive?
- 2 Is a cross between an unknown and a homozygous recessive?
- 3 When two alleles are equally expressed this is called?
- 4 Which is homozygous dominant or recessive for seed shape?
- 5 How are genes expressed in dominant and recessive patterns?
- 6 What’s the difference between homozygous and heterozygosus cross?
What happens when a homozygous dominant is crossed with a homozygous recessive?
A monohybrid cross between a parent that is homozygous dominant and a parent that is homozygous recessive for a particular trait produces offspring that are all heterozygous for that trait. These individuals have two different alleles for that trait.
Is a cross between an unknown and a homozygous recessive?
When a single trait is being studies, a test cross is a cross between an individual with the dominant phenotype but of unknown genotype (homozygous or heterozygous) with a homozygous recessive individual. If the unknown is heterozygous, then approximately 50% of the offspring should display the recessive phenotype.
When crossing a homozygous recessive with a heterozygote What is the chance of getting an offspring with the dominant phenotype?
The answer is 50%. Assume that the homozygous recessive trait is denoted by aa and the heterozygote is Aa.
When two alleles are equally expressed this is called?
If both alleles are dominant, it is called codominance?. The resulting characteristic is due to both alleles being expressed equally. An example of this is the blood group AB which is the result of codominance of the A and B dominant alleles.
Which is homozygous dominant or recessive for seed shape?
The (RR) genotype is homozygous dominant and the (rr) genotype is homozygous recessive for seed shape. In the image above, a monohybrid cross is performed between plants that are heterozygous for round seed shape. The predicted inheritance pattern of the offspring results in a 1:2:1 ratio of the genotype.
What is the predicted inheritance pattern for a homozygous genotype?
The predicted inheritance pattern of the offspring results in a 1:2:1 ratio of the genotype. About one-fourth will be homozygous dominant for round seed shape (RR), half will be heterozygous for round seed shape (Rr), and one-fourth will have the homozygous recessive wrinkled seed shape (rr).
How are genes expressed in dominant and recessive patterns?
For a gene that is expressed in a dominant and recessive pattern, homozygous dominant and heterozygous organisms will look identical (that is, they will have different genotypes but the same phenotype), and the recessive allele will only be observed in homozygous recessive individuals.
What’s the difference between homozygous and heterozygosus cross?
Homozygous vs. Heterozygous. A monohybrid cross between a parent that is homozygous dominant and a parent that is homozygous recessive for a particular trait produces offspring that are all heterozygous for that trait. These individuals have two different alleles for that trait.