Respuesta :
Answer:
a. (A_B_),(A_bb)(aaB_)(aabb)
Explanation:
This scenario is an example of recessive epistasis.
It involves two recessive alleles concealing the expression of an allele at varying locus.
The 9:7 ratio seen in this case is a rare form of epistasis known as duplicative recessive epistasis (a situation in which the other gene expression are masked due to the effect of either aa or bb presence on them).
In this scenario, if snails possess two copies of one or the other allele I.e allele a or allele b, pigment production would be inhibited leading to albino individuals.
A recessive phenotype is seen for a homozygous recessive gene at Gene A or Gene B.
Therefore, the genotypes of the offspring is AABB, AaBB, AABb, aaBb, aaBB, AAbb, Aabb and aabb.
Answer:
The genotype of pigmented snails are A_b_
The genotype of Albino snail are A_bb; aaB_
Explanation:
The parent genotypes and offspring phenotypic ratios in this table can help you figure out what kind of inheritance is at work.
Parent Genotypes Offspring Phenotypic Ratio Type of Inheritance
Aa x Aa 3 A_ : 1 aa Simple dominance, monohybrid cross
Aa x Aa 1 AA : 2 Aa : 1 aa Incomplete dominance
AaBb x AaBb 9 A_B_ : 3 A_bb : 3 aaB_ : 1 aabb Dihybrid cross
AaBb x AaBb 9 A_B_ : 3 A_bb : 4 aaB_ : aabb Recessive epistasis
AaBb x AaBb 12 A_B_ : A_bb : 3 aaBb : 1 aabb Dominant epistasis
