中国大学MOOC: A testcross can be used to determine whether an individual is homozygous or heterozygous.

In poodles, black is dominant to white. A black poodle is crossed with a white poodle. In a litter of four, all of the puppies are black. What is the best conclusion?? The black poodle is probably heterozygous.|The black poodle is probably homozygous|The black poodle is definitely homozygous.|The black poodle is definitely heterozygous.

An organism is said to be ( ) if it carries two identical alleles for a certain trait. A: heterozygous B: homologous C: homozygous D: monohybrid E: dihybrid

If an organism is said to be true breeding for a particular trait, this means that A: they are heterozygous for that trait. B: they are homozygous for that trait. C: they are incompletely dominant for that trait. D: they have two kinds of alleles for that trait.

Linked genes always exhibit A: phenotypes that are similar B: recombination frequencies of less than 50% C: homozygosity when involved in a testcross D: a greater number of recombinant offspring than parental offspring when involved in a testcross E: a lack of recombinant offspring when a heterozygous parent is involved in a testcross