Question

what does incomplete dominance entail in terms of genetic inheritance? a. one allele completely masks the other, resulting in no observable traits. b. both alleles are fully expressed leading to a phenotype that shows characteristics of both alleles distinctly. c. one allele is completely recessive, resulting in a hidden phenotype. d. neither allele is completely dominant, resulting in an intermediate phenotype. why do sex - linked traits differ between males and females? a. males have two copies of the x chromosome. b. both males and females equally inherit sex - linked traits. c. females have one x and one y chromosome. d. females have two x chromosomes, while males have one x and one y chromosome. which statement describes codominance accurately? a. neither allele is expressed, resulting in an absence of traits. b. one allele completely dominates the other, hiding its effects. c. both alleles are fully expressed, leading to a phenotype that shows characteristics of both alleles distinctly. d. both alleles blend to create a new phenotype. which of the following traits is typically associated with sex - linked inheritance? a. blood type b. color blindness c. height d. eye color which statement accurately describes polygenic inheritance? a. multiple genes contribute to a single phenotype, like height or skin color. b. it involves only one gene contributing to a single phenotype. c. polygenic traits are always dominant over other traits. d. environmental factors have no impact on polygenic traits. what is the significance of mendels experiments with pea plants? a. they disproved the theory of evolution. b. they established the principles of inheritance. c. they formed the basis of animal genetics. d. they were the first to study dna.

Explanation:

1. In incomplete - dominance, neither allele is completely dominant, resulting in an intermediate phenotype. For example, in snapdragons, a cross between red - flowered and white - flowered plants gives pink - flowered plants.
2. Sex - linked traits differ between males and females because females have two X chromosomes (XX), while males have one X and one Y chromosome (XY). This affects the expression of genes located on the sex chromosomes.
3. In codominance, both alleles are fully expressed, leading to a phenotype that shows characteristics of both alleles distinctly. For example, in blood types, AB blood type shows both A and B antigens.
4. Color blindness is a sex - linked trait. The genes for color vision are located on the X chromosome, and males are more likely to be affected due to having only one X chromosome.
5. Polygenic inheritance occurs when multiple genes contribute to a single phenotype, such as height or skin color. These traits often show a continuous range of variation.
6. Mendel's experiments with pea plants established the principles of inheritance, such as the law of segregation and the law of independent assortment.

Answer:

1. d. Neither allele is completely dominant, resulting in an intermediate phenotype.
2. d. Females have two X chromosomes, while males have one X and one Y chromosome.
3. c. Both alleles are fully expressed, leading to a phenotype that shows characteristics of both alleles distinctly.
4. b. Color blindness
5. a. Multiple genes contribute to a single phenotype, like height or skin color.
6. b. They established the principles of inheritance.