Single gene pair cross is also known as monohybrid cross. This means that only one gene usually with two alleles is observed and it express one trait.

For example, if we name the gene for a certain trait with A, the possible genotypes are AA (dominant homozygous), aa (recessive homozygous) and Aa (heterozygous). Possible crosses are:

P: AA x AA

F1 : all of them are AA

The same is with aa x aa (all of the offspring are with aa genotype)

P: AA x Aa

F1: AA Aa AA Aa (genotype ratio 1:1) (phenotype ratio 3:1)

The same genotype ratio is in aa x Aa (offspring will have aa Aa aa Aa-(genotype ratio 1:1) (phenotype ratio 1:1)

P: Aa x Aa

F1: AA Aa Aa aa (genotype ratio 1:2:1) (phenotype ratio 3:1)

P: AA x aa

F1: Aa Aa Aa Aa (1)

5 0

3 years ago

A plant cell has lost too much water due to evaporation by the sun. It needs more water from other cells. What structure would a

Maru [420]

Normally it’s the plasmodesmata that allows exchange of molecules between adjacent cells. But I’m still not sure if water is included!

3 0

2 years ago

Read 2 more answers

Explain two ways natural hazards can decrease the

Rzqust [24]

Answer:

When the natural resources Exhausted

6 0

3 years ago

Malaria is an infectious disease caused by a unicellular eukaryotic organism belonging to the genus Plasmodium. These eukaryotic

andreev551 [17]

Answer:

Parasitism.

Explanation:

Parasitism is the relationship that is present between Plasmodium and humans because one organism takes benefit from the other whereas the other get harmed by the other. In Plasmodium and humans relationship, human gets harmed from the mosquito by having malarial disease, while on the other hand, mosquito is benefitted by sucking of blood which is a food source for mosquitoes.

7 0

2 years ago