In humans, the absence of dimples dominates over their presence, and curly hair dominates over straight

In humans, the absence of dimples dominates over their presence, and curly hair dominates over straight ones. A woman with dimpled cheeks with straight hair and a man with no dimples and curly hair entered the marriage. It is known that the man’s mother had dimples and had straight hair. A) How many types of gametes does a man have? B) What is the probability (in%) of the birth in the family of a child who will be similar to the mother? Q) How many different phenotypes are there among children in this family? D) What is the probability (in%) of the birth in the family of a child similar to the father? E) How many different genotypes can there be among children?

Let’s designate the gene that causes the absence of dimples on the cheeks in a person as C, then the gene that determines their presence will be c.

Let’s designate the gene for curly hair as P, then the gene for straight hair will be p.

A woman with straight hair and no dimples on her cheeks will have a ssrr, because the traits classified as recessive can be realized externally only if the genotype is homozygous for them. This woman produces eggs of the same type cf.

The mother of the man, as well as the woman, possessed the ssrr genotype. She could only pass on genes for recessive traits to a man. Consequently, a curly-haired man without cheek dimples is heterozygous for both pairs of CcPp genes. It produces four types of sperm – cp, cp, cp, cp.

The possible offspring of this married couple will look like this:

children with dimples on the cheeks and straight hair (ccpp) – 25%;

children without dimples on their cheeks and with curly hair (CcPp) – 25%;

children without dimples on the cheeks and with straight hair (Сcpp) – 25%;

children with dimples on the cheeks and curly hair (ccPp) – 25%.

A) 4 types of gametes;

B) 25%;

C) 4 phenotypes;

D) 25%;

E) 4 genotypes.