Genetics Homozygous Quiz Questions

In  cats, the Manx (M) allele results in cats without tails, while the recessive allele (m) allows for tail growth. Homozygous M/M cats dies before birth. If 2 Manx cats mate, and they have 3 offspring, what is the chance that at least one has a tail?

Red hair is recessive to dark hair. Jenny has red hair and has 2  children with Tony who does not have red hair, but his mother does. What is the chance that both of their kids have red hair?

The A and B blood types differ by a carbohydrate at the end of a chain of carbohydrates.  In type O blood neither type of carbohydrate  is added to the chain. There is a condition called The Bombay phenotype in which the carbohydrate which normally has the A or B carbohydrates attached is missing. This is a recessive condition on another chromosome. Individuals who have this condition cannot have blood type A, B or AB even if their ABO alleles give that blood type.    We will use M to indicate the dominant allele and m to indicate the recessive allele.  Someone who is type O; +/- ; M/m has children with someone who is type AB; +/-; M/m. What is the chance that they have a type  B positive child?   Note that the M gene has no effect on the +/- gene.

Billy has the following genotype I^A I^B ; +/-  Penny has the following genotype I^A I^A; +/-What is the chance that they have a child who is type  A negative?

Billy has the following genotype I^A I^B ; +/-  Penny has the following genotype I^A I^A; +/- Which one of the following blood types could be found among the offspring

This disease is lethal and strikes early in childhood.

The pedigree below is

The pedigree below is

The genotype off the individual indicated by the arrow is