Question

1.У человека полные губы доминируют над признаком тонкие губы, а ямочка на щеках доминируют над гладкими щеками. Отец дигомозиготен, а мать дигетерозиготна P-? F-? Какой закон наследственности проявляется? Какова вероятность рождения ребёнка с признаками матери? 2. У человека карий цвет доминирует над голубым, а праворукость над леворукостью. Кареглазый правша, мать которого была голубоглазой правшой, а отец кареглазым правшой, женился на голубоглазой левше. P-? F-? Прошу кто не знает не отвечать! Спасибо)

Answer 1

Inheritance of Lip Shape and Cheek Dimples

The first question involves the inheritance of lip shape and cheek dimples. The person in question has full lips dominating over thin lips, and cheek dimples dominating over smooth cheeks. The father is homozygous dominant (digametic) for lip shape, while the mother is heterozygous (digametic) for lip shape. The question asks about the probability of a child inheriting the mother's traits.

To determine the inheritance pattern and probability, we need to know the specific mode of inheritance for these traits. However, without that information, we can make some general assumptions based on the given information.

If we assume that lip shape and cheek dimples are both controlled by a single gene with two alleles, where full lips and cheek dimples are dominant traits, we can use the Punnett square to calculate the probabilities.

Let's represent the dominant allele for full lips as "P" and the recessive allele for thin lips as "p". Similarly, let's represent the dominant allele for cheek dimples as "D" and the recessive allele for smooth cheeks as "d".

The father is homozygous dominant for lip shape (PP) and the mother is heterozygous (Pp). Therefore, the possible genotypes for the father are PP and the possible genotypes for the mother are PP and Pp.

Using a Punnett square, we can determine the possible genotypes and phenotypes of the offspring:

| | P | p | |-------|---------|---------| | P | PP | Pp | | P | PP | Pp |

From the Punnett square, we can see that there is a 50% chance of the child inheriting the dominant allele for lip shape (Pp) from the mother. However, without more information about the specific inheritance pattern, it is not possible to determine the probability of inheriting cheek dimples.

Inheritance of Eye Color and Handedness

The second question involves the inheritance of eye color and handedness. The person in question has brown eyes dominating over blue eyes, and right-handedness dominating over left-handedness. The person's mother was a blue-eyed left-hander, and the person's father was a brown-eyed right-hander. The question asks about the probability of the person's traits.

Again, without specific information about the inheritance pattern, we can make some general assumptions based on the given information.

If we assume that eye color and handedness are controlled by separate genes, we can use the Punnett square to calculate the probabilities.

Let's represent the dominant allele for brown eyes as "B" and the recessive allele for blue eyes as "b". Similarly, let's represent the dominant allele for right-handedness as "R" and the recessive allele for left-handedness as "r".

The father is a brown-eyed right-hander (BBRR) and the mother is a blue-eyed left-hander (bbrr). Therefore, the possible genotypes for the father are BBRR, the possible genotypes for the mother are bbrr, and the possible genotypes for the child are BbRr.

Using a Punnett square, we can determine the possible genotypes and phenotypes of the offspring:

| | B | b | |-------|---------|---------| | B | BB | Bb | | b | Bb | bb |

| | R | r | |-------|---------|---------| | R | RR | Rr | | r | Rr | rr |

From the Punnett square, we can see that there is a 50% chance of the child inheriting the dominant allele for eye color (Bb) from the father and a 50% chance of inheriting the dominant allele for handedness (Rr) from the father. However, without more information about the specific inheritance pattern, it is not possible to determine the probability of inheriting specific traits.

Please note that these calculations are based on general assumptions and may not accurately represent the actual inheritance patterns for these traits. It is always best to consult with a genetic counselor or conduct further research for a more accurate understanding of specific inheritance patterns.