Question

1,укажіть співвідношення фенотипів у разі схрещування особин генотипів Аа і Аа А) 1:1 Б)3:1 В)1:2:1 Г)1:1:1:1 2,Укажіть гомозиготну особинуз домінантними алелями генів А)аавв Б)ААВВ В)ааВВ Г)ААвв 3,Укажіть гетерозиготну особину за обома алелями А)аавв Б)ААВВ В)ААвв Г)АаВв 4,Укажіть успадкування якої з хвороб у людини зчеплене із статтю А)синтром Дауна Б)дальтонізм В)серпоподібна анемія Г)фенілкетонурія

Answer 1

1. Б
2. Б
3. Г
4. Б
Четверте не точно, перевірте

Answer 2

I will answer your questions in detail. Please note that I am not a biology expert, so I may not be able to explain everything in depth. I am using the information from the web search results that I found for your query.

1. The ratio of phenotypes in the case of crossing individuals with genotypes Aa and Aa depends on the type of dominance of the alleles. If there is complete dominance, then the ratio will be 3:1, meaning that three out of four offspring will have the dominant phenotype and one will have the recessive phenotype. If there is incomplete dominance, then the ratio will be 1:2:1, meaning that one out of four offspring will have the dominant phenotype, two will have an intermediate phenotype, and one will have the recessive phenotype. If there is codominance, then the ratio will be 1:1:1:1, meaning that each offspring will have a different phenotype that reflects both alleles. Therefore, the correct answer is B) 3:1 if there is complete dominance, C) 1:2:1 if there is incomplete dominance, or D) 1:1:1:1 if there is codominance.

2. A homozygous individual with dominant alleles of genes has two copies of the same dominant allele for each gene. For example, if A and B are dominant alleles, then a homozygous individual with dominant alleles of genes would have the genotype AABB. Therefore, the correct answer is B) AABB.

3. A heterozygous individual for both alleles has one copy of each allele for each gene. For example, if A and B are dominant alleles, and a and b are recessive alleles, then a heterozygous individual for both alleles would have the genotype AaBb. Therefore, the correct answer is D) AaBb.

4. The inheritance of some diseases in humans is linked to sex chromosomes. This means that the genes that cause these diseases are located on either the X or the Y chromosome, and their expression depends on the sex of the individual. For example, hemophilia and color blindness are caused by recessive genes on the X chromosome, and they are more common in males than in females, because males only have one X chromosome and therefore only need one copy of the recessive gene to express the disease. Down syndrome, on the other hand, is not linked to sex chromosomes, but rather to an extra copy of chromosome 21. Sickle cell anemia and phenylketonuria are also not linked to sex chromosomes, but rather to autosomal recessive genes on other chromosomes. Therefore, the correct answer is B) color blindness.