4) All the offspring of a cross between a black-eyed Mendelian and an orange-eyed Mendelian have black eyes. What is the expected phenotypic ratio of a cross between two orange-eyed Mendelians?

0 : 1 ( black eyed : orange eyed )

Explanation:

When black eyed-Mendelian is crossed with orange-eyed Mendelian, the entire progeny has black eyes. This means that the allele for Black color is dominant to the color for orange color and it masks its effect completely in the next progeny.

BB X bb = Bb ( All black )

So orange Mendelian is a recessive trait and will have genotype bb. When two orange eyed Mendelians are crossed:

bb X bb = bb ( All orange since there is no B allele )

Hence, the phenotypic ratio will be = 0 : 1 ( black eyed : orange eyed )

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succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: