n some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted). 10pts a) What is the genotype for black chickens? b) What is the genotype for white chickens? c) What is the genotype for erminette chickens? d) Two erminette chickens were crossed. Show the Punnett square. e) What’s the probability they would have a black chick? ____% f) What’s the probability they would have a white chick? ____% g) What’s the probability they would have erminette chick? ___ %

2) A man with a recessive sex linked allele for colour blindness marries a woman who has normal vision but is a carrier of the recessive allele. What proportion of the offspring would be expected to ...... a) be male b) have normal vision c) be colour blind

Sickle-cell disease is a recessive trait in humans. In a cross between a father who has sickle-cell disease and a mother who is heterozygous for the sickle-cell allele, what is the probability that all of their first three children will be unaffected? A) 1/4B) 1/2C) noneD) 1/8E) 1/16

all of the offspring of a cross between a black eyed mendelien and an orange-eyed mendelien have black eyes. This means that the allele for black eyes is ___ the allele for orange eyes. A)Codominant toB)more aggressive thanC)recessive toD)dominant toE)better than

A trait with a high concordance value in MZ twins has a   a) significant environmental component. b) significant random component. c) significant inherited component. d) no conclusions can be drawn in this case.

2). In rabbits, coat colour patterns are determined by 3 alleles at one locus. Agouti is dominant over Himalayan and both are dominant over albino. Give all the possible genotypes of a) agouti rabbits b) himalyan rabbits c) albino rabbits

In a cross between an aabb animal and an AABb animal, what fraction of the offspring are expected to have the AaBb genotype? a) 25% b) 50% c) 75% d) 100% e) 0%

An unaffected woman for a human disorder marries and unaffected man and they have children. This results in 3 affected sons, and one unaffected daughter, which ends up having children later on with an unaffected man and has 2 affected sons. A) Draw a simple pedigree diagram for this family, including a legend. B) What is the likely mode of inheritance of this trait: Please explain C) Provide the genotypes of the original mother and the daughter. Use a capital letter for the dominant allele and lowercase letter for the recessive allele. D) If one of the affected sons from the original marriage marries a 2nd cousin that is a carrier of this trait and has children, what is the probability that they will have 3 affected sons?

Curly hair is due to a dominant allele in humans. Straight hair is a recessice allele. the heterozygous condition produces wavy hair, a. phenotype that appears as a blend of the two alleles. This is an example of which of the following patterns of inheritance.   a) Simple dominant b) Sex linkage C) Multiple allele d)Incomplete dominance

In cats, long hair is recessive to short hair. A homozygous short haired male is mated with a long haired female.  a) Show the genotypes of the parents, using proper notation.  b) What will their kittens look like?   What is the best example of genotype: a) the physical appearance of an organism b) the length of stem in a pea plant c) TT d) a short-haired cat a) Show the genotypes of the parents, using proper notation.  b) What will their kittens look like?