Table of Contents
- 1 Which genes do not show independent assortment?
- 2 Do traits always get passed on following the same pattern as Mendel observed in his pea plants?
- 3 What does it mean when pea plants are described as true breeding?
- 4 Why linked genes do not assort independently?
- 5 Why were pea plants chosen for Mendel’s experiment?
- 6 What Did Mendel’s genetic model predict?
- 7 Why do pea plants not have white flowers?
- 8 Why are green peas more dominant than yellow peas?
Which genes do not show independent assortment?
There are, however, gene pairs that do not assort independently. When genes are close together on a chromosome, the alleles on the same chromosome tend to be inherited as a unit more frequently than not. Such genes do not display independent assortment and are said to be linked.
Do traits always get passed on following the same pattern as Mendel observed in his pea plants?
Genes located on different chromosomes will be inherited independently of each other. Mendel observed that, when peas with more than one trait were crossed, the progeny did not always match the parents. This is because different traits are inherited independently – this is the principle of independent assortment.
Why did Mendel look at pea plant instead of humans to study genetics?
To study genetics, Mendel chose to work with pea plants because they have easily identifiable traits (Figure below). For example, pea plants are either tall or short, which is an easy trait to observe. Mendel also used pea plants because they can either self-pollinate or be cross-pollinated.
How Mendel’s pea plants helped understand genetics?
Mendel demonstrated that the inheritance of certain traits in pea plants follows particular patterns, now referred to as the laws of Mendelian inheritance. He began separating the wrinkly peas from the shiny peas and studying which characteristics were passed on when the next crop of peas were grown.
What does it mean when pea plants are described as true breeding?
Mendel’s Crosses The result is highly inbred, or “true-breeding,” pea plants. These are plants that always produce offspring that look like the parent. By experimenting with true-breeding pea plants, Mendel avoided the appearance of unexpected traits in offspring that might occur if the plants were not true breeding.
Explain why linked genes do not assort independently. Linked genes tend to be inherited together because they are located on the same chromosome. Map units indicate relative distance and order, not precise locations of gene. Distinguish between linked genes and sex-linked genes.
Why is it not possible to study the pattern of inheritance of traits in human beings?
Answer : It is not possible to study the inheritance pattern of traits in human beings; the same way as it is done in pea plant because, the pea plant undergoes self-pollination in every generation thereby keeping it pure. That is control crosses cannot be performed in humans.
How do Mendel experiment show that the traits are inherited independently?
In a hybridization, Mendel selected two pairs of contrasting characters and that they were crossed. The resultant cross showed the segregation of the traits of both the oldsters which indicated that the traits were inherited independently.
Why were pea plants chosen for Mendel’s experiment?
Studying traits in peas Mendel studied inheritance in peas (Pisum sativum). He chose peas because they had been used for similar studies, are easy to grow and can be sown each year. Pea flowers contain both male and female parts, called stamen and stigma, and usually self-pollinate.
What Did Mendel’s genetic model predict?
What did Mendel’s genetic model predict? Parents are equally important in the transfer of genetic information. an alteration of DNA in a parent’s egg or sperm. The “unit of inheritance” is the cell.
What are the genes for pea seed shape?
Researchers have already identified the genes behind plant size, pea seed colour and seed shape. Anthocyanin is responsible for red, blue and purple colours seen in many plants. Anthocyanin pigments are antioxidants – they mop up DNA-damaging free radicals
What are the alleles of a yellow pea plant?
(These particular alleles also can go by I for yellow and i for green.) Since Mendel’s plants were purebred, the yellow peas had two yellow alleles and so were YY and the green peas had two green alleles and were yy. Each parent can pass one copy of their gene to the next generation.
Why do pea plants not have white flowers?
The pea plants with this version of the gene don’t make anthocyanin pigments and have white flowers. To test the gene’s function, the researchers expressed the gene transiently in pea petals. They did this using biolistics – firing copies of the gene construct into pea petals from a gene gun.
Why are green peas more dominant than yellow peas?
Green happens when a gene that turns on chlorophyll-degrading genes isn’t working. Which makes explaining why yellow is dominant a bit easier. Mendel’s green and yellow peas taught us about dominant and recessive traits. Here is his experiment: