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Stolb23 [73]
3 years ago
10

Please help soon!

Biology
2 answers:
saw5 [17]3 years ago
5 0
A chromosome contains one long DNA strand.

B.
guajiro [1.7K]3 years ago
5 0

The answer to your question is B

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You are given two true-breeding groups of gerbils. The gerbils in the first group have black fur and curly tails; the gerbils in
Alexxx [7]

Answer:

3 black gebrils have straight tails

Explanation:

Given -

First group of true breeding gebrils have black fur and curly tails

Second group of true breeding gebrils have yellow fur and straight tails

After the F1 generation, all the offspring would have black fur and curly tail

This means black fur is dominant over yellow fur and curly tail is dominant over straight tails

Let "Black fur" be represented by "B" and "yellow fur" be represented by "b"

Let curly tail be represented by "C" and straight tail be represented by "c"

Then parents genotype for F1 generation would be "BBCC" and "bbcc"

and genotype of first generation offspring would be "BbCc"

BbCc

BC         Bc         bC        bc

BC BBCC BBCc BbCC BbCc

Bc BBCc BBcc BbCc Bbcc

bC BbCC BbCc bbCC bbCc

bc BbCc Bbcc bbCc bbcc

Black Curly – BBCC, BBCc, BbCC, BbCc, BBCc, BbCc, BbCC, BbCc, Bbcc,  

Yellow curly- bbCC, bbCc, bbCc

Black straight – BBcc, Bbcc, Bbcc

Yellow straight- bbcc

3 black gebrils have straight tails

6 0
3 years ago
Define vaccine and describe two types of vaccines. how do vaccines work to protect the body from disease?
Ivanshal [37]
A vaccine is a substance that supports the body to produce antibodies and offer immunity in contradiction of a disease. A live attenuated vaccine comprises a version of the living microbe that has been destabilized because they are still alive this is the closest thing to an actual infection and will habitually lead the body to have a lifelong immunity after only one or two doses. A killed vaccine is created by killing the illness with chemicals, heat or radiation in which these vaccines are harmless but rouse a weaker immune reaction.
8 0
3 years ago
Question 3<br> Which of the following statements about environmental changes is true?
Serggg [28]

Answer:

The options are

A) they may affect several populations in an ecosystem

B) they cannot be caused by human activity

C) they affect food chains but not food webs

D) They have no effect on living organisms in an ecosystem him

The answer is A) they may affect several populations in an ecosystem

Explanation:

Environmental changes include deforestation and climate changes. Organisms depend on their habitat and climatic conditions for their survival because it determines their food availability too.

When environmental change occurs they may affect several populations in an ecosystem.

8 0
3 years ago
He Earth is constantly spinning on its axis, like you might spin a basketball on your finger.
inn [45]

Answer:

the cycle of night and day

hope this helps :p

Explanation:

3 0
3 years ago
Which of the following makes up the top layer of a soil profile?
larisa [96]

Answer:

I think its organic material from plants and animals

Explanation

Edge 2020

5 0
3 years ago
Read 2 more answers
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