If all of the offspring of a testcross have the same phenotype, the genotype of the unknown parent is most likely: O Heterozygous O Homozygous recessive O Homozygous dominant O Cannot be determined

Hemophilia, disease in which the blood lacks a clotting factor, is caused by an X linked recessive gene. Joe doe not have hemophilia and Lucille is heterozygous for the condition.  What is the chance that their MALE child will have hemophilia? (Note: you are calculating the probability for their MALE children only, in other words if they have 1 male child, what is the probability that he will be born with the disease?)     0%     1/4 or 25%     2/4 or 50%     3/4 or 75%     4/4 or 100%

An individual with the genotype AA is crossed with an individual with the genotype Aa, producing 120 offspring. The number of offspring with genotype AA will be close to * O 120 90 O 60 30

The presence of horns on satyrs is produced by a sex-influenced autosomal gene that is dominant in males and recessive in females. A horned female is crossed with a hornless male. The F1 are then intercrossed to produce the F2. What proportion of the F2 generation will be horned? O % of the males and none of the females O % of males and % of females O All of the males and none of the females O % of the males and % of females O ½ of the males and none of the females

1) There are lots of new terms this week. Define and provide an example of: Incomplete Dominance Organelle Inheritance Codominance Nondisjunction X inactivation Pleiotropy Sex Linkage Epistasis Linkage Polygenic inheritance.

Which of the Pedigree Diagrams below is most likely to show a family with Becker muscular dystrophy?

In mice coloring is determined by three alleles of the agouti gene.  AA, codes for agouti coloring, AT codes for black with tan belly, and AB codes for all black.  The dominance order is AA>AT>AB. What proportion of offspring are expected to be black with a tan belly from the following cross  ABAT x AAAT?     1/8     none     3/4     1/4     1/2

in a specific dihybrid cross, the F2 phenotypic ratio is 12:3:1. What is the most likely explanation for this distribution of offspring? And please explain how you got the answer in a small summory for me to understand and learn.