Question 1
The alleles of linked genes tend to ________.
◦ segregate together during gamete production
◦ assort independently
◦ be mutated more often than unlinked genes
◦ experience a higher rate of crossing over
◦ assort independently and show a higher rate of crossing over
Question 2
The order of genes on a plant chromosome is
A,
B, and
D, where A and B have a recombination frequency of 0.2, and
B and
D have a recombination frequency of 0.3. A pure-breeding plant that has the dominant
A and
D phenotypes with a recessive b phenotype is crossed to a pure-breeding plant that has the recessive a and d phenotypes with the dominant B phenotype. The resulting hybrid is crossed to a plant that has all three recessive phenotypes. Under the assumption that the value for interference in this region is zero, what percentage of each progeny type would result from a single crossover between
B and
D?
◦ 24%
ABd/ abd; 24%
abD/ abd◦ 7%
ABD/ abd; 7%
abd/ abd◦ 12%
Abd/ abd; 12%
aBD/ abd◦
50% AbD/ abd; 50%
aBd/ abd◦ 9%
ABD/ abd; 9%
abd/ abd
Developmental steps in the formation of a plant embryo
Plant
Plant
The human chromosome set
Some of the Various E. coli Genes and Their Products or Role in Replication
The potential involvement of colchicine in doubling the chromosome number