Question

У человека карий цвет глаз и способность правши наследуются как доминантные признаки.кареглазый юноша правша гомозиготный по обоим признакам женится на голубоглазой левше определите фенотипы детей. Биология 9 класс

Answer 1

Признак | ген | генотип
карие | А | АА, Аа
правша | В | ВВ, Вб
голубые| а | аа
левша | б | бб
----------------------
оформление задачи:
-----------------------
Р жен. аaбб × муж. ААВВ
/ \ / \
g аб АВ
F1 AaBб
Ответ: родится кареглазый правша

Answer 2

Inheritance of Eye Color and Handedness

Eye color and handedness are both inherited traits. In this scenario, we have a brown-eyed right-handed individual who is homozygous dominant for both traits. They marry a blue-eyed left-handed individual. We need to determine the phenotypes of their children.

Eye color is determined by multiple genes, but for simplicity, let's assume it is controlled by a single gene with two alleles: brown (B) and blue (b). Brown eye color is dominant over blue eye color. Handedness is also influenced by multiple genes, but again, for simplicity, let's assume it is controlled by a single gene with two alleles: right-handedness (R) and left-handedness (r). Right-handedness is dominant over left-handedness.

Since the individual is homozygous dominant for both eye color and handedness, their genotype is BBRR. The individual's genotype for eye color is BB, and for handedness, it is RR.

The blue-eyed left-handed individual would have the genotype bbrr.

When these two individuals have children, each parent will contribute one allele for each trait. The possible combinations of alleles for eye color are Bb and bb, and for handedness, they are Rr and rr.

Phenotypes of the Children

Let's consider the possible combinations of alleles and determine the phenotypes of the children:

1. If the child inherits the allele combination BbRr, they will have brown eyes and be right-handed. 2. If the child inherits the allele combination Bbrr, they will have brown eyes and be left-handed. 3. If the child inherits the allele combination bbRr, they will have blue eyes and be right-handed. 4. If the child inherits the allele combination bbrr, they will have blue eyes and be left-handed.

Therefore, the possible phenotypes of the children are: - Brown eyes and right-handed - Brown eyes and left-handed - Blue eyes and right-handed - Blue eyes and left-handed

It's important to note that these predictions are based on simplified assumptions and that eye color and handedness are influenced by multiple genes. Additionally, environmental factors can also play a role in the development of these traits.

I hope this helps! Let me know if you have any further questions.