In a dihybrid cross, the f2 will have nine genotypes, but only four phenotypes because the genes cause the traits to mask the traits.
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The given question is incorrect. The correct question is:

Question: In a dihybrid cross, the F2 will have nine genotypes, but only four phenotypes because the genes cause the traits to mask the traits.

In a dihybrid cross, the F2 will have nine genotypes, but only four phenotypes because the HETEROZYGOUS genes cause the DOMINANT traits to mask the RECESSIVE traits.

Explanation:

In a dihybrid cross, only four phenotypic classes are observed while there is a total of nine different genotypes. This occurs since many F2 genotypes are heterozygous for one or another gene. These heterozygous genotypes produce only dominant trait while the recessive traits are masked. For example, a dihybrid cross TtRr x TtRr gives nine different genotypes. The genotype TtRR, TtRr, TTRR, and TTRr would express the dominant traits for both the genes and would have the same phenotype.

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]