Which genes are most likely to travel together a genes on ho

Which genes are most likely to travel together?

a. genes on homologous chromosomes
b. genes on the same chromosome
c. genes separated by the smallest distance, in map units, on the same chromosome
d. genes at the opposite tips of the same chromosome

In a three-point cross, which group is the double crossovers?

a. the largest proportion
b. the smallest proportion
c. there are no double crossovers in a three-point cross
d. the sum of the single crossovers

In a cross between a fly with the recessive traits a and b and a fly heterozygous for these traits, all the offspring are either wild type or exhibit both recessive traits. This suggests that the loci for traits a and b are:

a. unlinked.
b. more than 50 map units apart.
c. completely linked.
d. Linkage information cannot be inferred from this result.

In a testcross between a fly that is a+b+c+ and heterozygous at all three loci and a fly that is a b c, the smallest phenotypic class is a+b c. What is the order of these genes on the chromosome?

a. a b c

b. a c b

c. b a c

d. c b a

Solution

Option (d) is correct because according to given statements genes seperated by the smallest distance ,in the map units on same chromosome are linked together because near by genes are linked and three point cross occurs in the smallest proportion and if offsprings are wild type means genes which get cross over are wild type