Biology, 25.01.2020 01:31 Arealbot

In freshwater snails, pigment color is influenced by two genes. if two heterozygous pigmented freshwater snails were crossed and offspring were produced in a ratio of 9 pigmented snails to 7 albino snails, what are the genotypes of the offspring?

a. ()()
b. genotype of pigmented snail
c. genotype of albino snails

Answers: 1

Show answers

Answers

Answer from: georgesarkes12

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 from: judydorcelyjudy21

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 GenotypesOffspring 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

Answer from: Quest

Answer : romans built laws to manage the pollution which was lead by smoke produced by the factories.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.

Answer from: Quest

Exposure to solar flares would be the correct answer

Another question on Biology

Biology, 21.06.2019 19:20

If vegetable oil is made out of veggies, then what is baby oil made out of?

Answers: 2

Answer

Biology, 22.06.2019 01:00

In which terrestrial biome can you find trees that produce cones instead of flowers and needles instead of leaves? have trees that produce cones instead of flowers and needles instead of leaves. the latitudes in this biome have evenly distributed precipitation throughout the year. is it high or low

Answers: 2

Answer

Biology, 22.06.2019 02:00

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that a) the four organisms do not have a common ancestor. b) humans are more closely related to chimps than any other apes. c) chimps are more closely related to gorillas than they are to humans. eliminate d) there is no evidence if any relationship between the four branches on the tree.

Answers: 3

Answer

Biology, 22.06.2019 03:00

What percentage of light hits earth's surface directly?

Answers: 3

Answer

You know the right answer?

In freshwater snails, pigment color is influenced by two genes. if two heterozygous pigmented freshw...

Questions