HW Linked Genes Flashcards
(14 cards)
If two genes assort independently from each other, what can be concluded about their linkage?
They must be members of different linkage groups.
This statement is false.
What is a crossover in meiosis?
An exchange of genetic material between non-sister chromatids of homologous chromosomes.
Crossover is a crucial mechanism for genetic diversity.
During a mapping experiment, will the number of observed double crossover events always equal the number of expected crossover events?
False.
This statement is false.
What does the total number of autosomal linkage groups in a cell equal?
The number of different pairs of homologous autosomes in a cell.
This statement is true.
What is the relationship between the distance of two genes on a chromosome and the likelihood of recombination?
The closer two genes are, the less likely recombination will occur between them.
This statement is true.
Can two genes that are on the same chromosome ever appear unlinked?
False.
This statement is false.
What do recombinant offspring inherit?
The same allele combinations as their parents had.
This statement is false.
When does crossing over occur?
During Meiosis I.
This statement is true.
What must your null hypothesis be when using chi-square analysis on possibly linked genes?
That the genes are not linked.
This statement is true.
What does crossing over allow for linked genes?
Reassortment of linked genes.
This statement is true.
What organism did Mendel use for his research?
Garden peas.
Mendel used seven pairs of traits in his experiments.
How many linkage groups do garden peas have when diploid?
Seven.
The haploid number of garden peas is seven.
For two different genes on the same chromosome that are more than 50 mu apart, what is expected from a testcross?
A maximum of only 50% recombinant offspring.
This is based on the principles of genetic linkage.
What is true about mitotic recombination?
It can produce portions of tissue with different allele combinations than found in the surrounding tissue.
This is an important aspect of genetic variation.
