During the Green Revolution pesticides

In Drosophila, an autosomal gene determines the shape of the hair, with B giving straight and b giving bent hairs. On another au

klasskru [66]

Answer:

a. F1 genotype : IiBb F1 phenotype : Hairless

F2 genotype and phenotype :

I_B_ (hairless), iiB_ (straight), iibb (bent)

b. IiBb X iiBb

Explanation:

a. Fly 1 : pure breeding straight haired : iiBB

Fly 2 : pure breeding hairless with bent genotype : IIbb

Fly 1 X Fly 2 : iiBB X IIbb = IiBb (F1)

All the offspring will be hairless since there is one dominant I allele which will inhibit hair production regardless of the type of allele of other gene.

Two F1 flies will be crossed to obtain F2 flies. IiBb X IiBb :

I_B_ : hairless = 9

I_bb : hairless = 3

iiB_ : straight hair = 3

iibb : bent hair = 1

Hairless : straight : bent will be in 12 : 3 : 1 ratio.

b. The offspring of this cross :

hairless : I_ _ _

straight : iiB_

bent : iibb

There is a bent offspring which has both the recessive alleles of both the genes. Hence it must have obtained the two alleles from the two parents. So their genotype is _i_b and _i_b.

Half of the offspring are hairless as given by the ratio. This is only possible if the cross is between Ii and ii fly:

I i

i Ii ii

So the genotype is Ii_b and ii_b.

The remaining hairy flies are in 3:1 ratio of straight to bent. This is only possible if the cross is between Bb and Bb fly:

B b

B BB Bb

b Bb bb

So the final genotype of the flies is IiBb and iiBb.

4 0

4 years ago

Form a hypothesis: You observe mold growing in one side of a slice of bread, but not on the other side. Form a hypothesis to exp

boyakko [2]

Answer:

Read explanation.

Mold:

Molds are a type of fungus with a multicellular growth (opposite of yeasts) and tend to grow in hot and warm but also humid environment.

Explanation:

A hypothesis is an idea of what is causing a problem or the what the origins of the problems are.

In this case, a possible hypothesis is that the "molded" side of the bread is having a different exposure to the external environment, such as hot/warm but humid/wet-ish conditions.

Hope it helped,

BiologiaMagister

8 0

4 years ago

Read 2 more answers

smooth muscle fibers can sustain a contraction without fatigue by allowing dephosphorylated myosin to remain attached to actin i

amid [387]

Smooth muscle fibers can sustain a contraction without fatigue by allowing dephosphorylated myosin to remain attached to actin in what is called the Latch State.

Latch State- Myosin cross-bridge creation with actin is prevented by dephosphorylating its RLCs, however dephosphorylating myosin that is already attached to actin slows down its off rate, creating the so-called "latch state." In the latch state, smooth muscle maintains tension while undergoing modest rates of ATP hydrolysis.

ATP hydrolysis- When the high-energy phosphoanhydride bonds in adenosine triphosphate are split, as occurs, for example, in muscles, chemical energy that has been stored in them is released. This process is known as ATP hydrolysis.

To know more about the Latch State, click on the below link,

brainly.com/question/15242112

#SPJ4

8 0

2 years ago

which of the following best describes the relationship between the structure of the cell membrane and its function?

forsale [732]

The proteins that are embedded in the cell membrane act as channels to transport substances in and out of the cell.

6 0

3 years ago

Dividing cells must pass through the phases of mitosis in the following order: Prophase, Metaphase, Anaphase, and Telophase. Tru

balu736 [363]

Answer:

True

Explanation:

Because the M phase which is mitosis that's where the cell divides and the phase of mitosis is: Prophase, Metaphase, Anaphase, Telophase and cytokinesis.

5 0

2 years ago