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2 years ago

How many individuals in the F1 generation do not have the widow's peak trait? and why ?

Biology

1 answer:

Nana76 [90]2 years ago

6 0

I can’t read it i need my glasses but i lost them do you know where they are?

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In Drosophila, the genes for body coloration and eye size are on different chromosomes. Normal-colored bodies are dominant to eb

Yuri [45]

Answer:

225 flies

Explanation:

Let gene for body colour : A

Let gene for eye type : B

Parent 1 : normal body and normal eyes = AABB

Parent 2: ebony body and eyeless = aabb

F1 : AABB X aabb = AaBb ( all have normal body and normal eye )

F1 progeny is self crossed given that the two genes are on different chromosomes which means they show independent assortment:

AaBb X AaBb =

A_B_ = normal body, normal eyes = 9

aaB_ = ebony body, normal eyes = 3

A_bb = normal body, eyeless = 3

aabb = ebony body, eyeless = 1

Hence the ratio is 9 : 3 : 3 : 1

Out of the 400 flies:

(9/16) * 400 = 225 flies have normal body colour and normal eyes

7 0

3 years ago

Is the current rate of species loss 10 times the typical rate of extinction?

Anika [276]

The natural rate of extinction as assumed by science is about 5 species per year. Currently scientists estimate we are losing species at 1000-10000 times that rate, with multiple species disappearing every day. A note on this idea is that the average extinction rate gives an unrealistic depiction of nature when we consider the catastrophic extinction events that ended the dinosaurs and shaped the ice age.

7 0

3 years ago

Produces thick mucus to neutralize the normally acidic environment of the vagina

strojnjashka [21]

Answer:The seminal vesicles produce mucus to neutralize the acidic environment of the vagina.

Explanation:

The seminal vesicles is found in male reproductive system which produces mucus that is alkaline in order to protect the sperm from the acidic environment of the female vagina . This also contain sugar to nourish the sperm.

The vargina is the outer opening of female reproductive system that receives the sperm. It is acidic in nature because it discharge fluids that contain liquid, cells and bacteria that lubricate and protect it.

8 0

3 years ago

Stem cell technology has been useful in many ways. Which of the following would be the most likely use for stem cells?

Mashcka [7]

Answer:

To regenerate damaged tissue

Explanation:

Stem cells can be pluripotent, totipotent or multipotent depending on where they are sourced. This means that they are capable of differentiating into a wide variety of cells. Stem cells can, therefore, be harvested and induced to differentiate into cells or tissues that are intended to be repaired.

4 0

3 years ago

what does the term expression mean in everyday language? How does the meaning of this word relate to the concept of gene express

Sunny_sXe [5.5K]

Answer:Expression means the process of making known ones thoughts and feelings. This relates to the concept of gene expression by the fact that the genes characteristics are made known through the phenotypes and the characteristics of the gene and it's information becoming known. The process of making things known in gene sequencing and the creation of proteins and its job.

Explanation:

I hope this helps I haven't taken bio in a couple years lol.

5 0

3 years ago