What will be the genotypes and phenotypes of children for the Rh factor, if: a) the mother and father are

What will be the genotypes and phenotypes of children for the Rh factor, if: a) the mother and father are homozygous Rh-positive; b) the mother is homozygous Rh-positive, the father is Rh-negative; c) the mother is homozygous Rh-positive, the father is heterozygous Rh-positive; d) the mother is heterozygous Rh-positive, the father is homozygous Rh-positive; e) both parents are heterozygous Rh-positive; f) the mother is heterozygous Rh-positive, the father is Rh-negative; g) mother is Rh negative, father is heterozygous Rh positive; h) both parents are Rh negative.

Let’s designate the gene that causes a positive Rh factor in humans as R, then the gene that causes a negative Rh factor will be designated as r.

a) Mother and father are Rh-positive homozygotes RR. They produce R germ cells. All children will have the RR genotype and be Rh positive;

b) Mother – RR, produces R gametes; father – rr, produces spermatozoa r. all offspring are Rh-positive heterozygotes Rr;

c) Mother – RR, produces R eggs; father – Rr, produces two types of spermatozoa – R and r. Offspring: 50% – Rr, 50% – RR, all children are Rh-positive;

d) Mother – Rr, produces eggs – R and r; father – RR, produces spermatozoa R. Offspring: 50% – RR, 50% – Rr, all children are Rh-positive;

e) Both mother and father – Rr. They produce two types of germ cells – R and r. Offspring: 25% – rr: Rh negative homozygotes; 50% – Rr: Rh-positive heterozygotes; 25% – RR: Rh-positive homozygotes;

f) Mother – Rr, eggs R and r; father – rr, produces sperm of the same type – r. Offspring: 50% – Rr: Rh-positive heterozygotes, 50% – Rh-negative homozygous children;

g) Mother – rr, eggs – r; father – Rr, sperm – R and r. Offspring: 50% – Rr: Rh positive heterozygotes, 50% – rr: Rh negative homozygous children;

h) Both mother and father – rr. They produce the same type of sex cells – r. Offspring: All children are homozygous rr and Rh negative.