Genetics Answers

Assume that congenital dislocation of the lumbar joint is dependent upon the action of a dominant allele
with 25% penetrance (the frequency with which a dominant or homozygous recessive gene manifests itself
in the phenotype of an individual). Frequency of the disorder is 6:10,000. State the number of homozygous
individuals for the recessive allele.

In a cross of AaBb x AaBb, what fraction of the offspring can be expected to express one of the two dominant alleles, but not both?

The following is a hypothetical situation. Assume that the presence and color of hair in a breed of dog is controlled by 2 separate genes. The first gene
controls the presence or absence of hair. Individuals who are homozygous recessive have hair, while those with at least one dominant allele are naked/hairless.
The second gene for hair color produces either blond, brown, or black hair, with those that are homozygous for one allele having blond hair, those who are
homozygous for the other allele having black hair, and the heterozygous individuals being brown-haired.
Show the offspring be for the following cross:
A hairless male is crossed with a brown-haired female. The male had a black-haired mother and a hairless father with blond-haired genes

Write an account on the components and regulation of gene expression in lac
(lactose) operon with the help of clear and well labelled diagram.

The goat's skin cell contains 60 chromosomes. How many chromosomes does a goat's sperm cell have?

With regard to the HLA-A and HLA-B antigens complete the genotypes, haplotypes and decide if the marked man can be the biological father of the child:

Phenotype of mother:HLA-A2,32; B13,35 : What genotypes and haplotypes does she
have?

Phenotype of child: HLA-A1,32; B8,35 :What genotypes and haplotypes does the child
have?

Phenotype of marked man: HLA-A2; B7,13 :What genotypes and haplotypes does he have?
Can he be the biological father of the child?

A mother with blue eyes (bb) and a father with brown eyes (Bb) want to have children. what are the
Genotypes
Phenotypes
percentages?

A mother with blue eyes (bb) and a father with brown eyes (Bb) want to have children.
Mother: ________ x Father: _________
Genotypes Phenotypes %

Assume a male with type O blood mates with a female who has type A blood. The female's mother had type A blood and her father had type B. What is the probability that their first child will have type A blood? What is the probability that their third child will have type O blood?

A man of the blood group O (genotype OO) married a woman of the blood group B (genotype BB). They have twins of the blood group O. Determine the possible genotypes of each member of the family with regard to the ABO blood types and locus H and explain this situation.

Can you help me with this please? I don't know how to even start