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tresset_1 [31]
3 years ago
8

Can someone please help? no links 20 points

Biology
1 answer:
Papessa [141]3 years ago
5 0
I did this with my teacher , it’s B
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Different ratios occur in crosses with single gene pairs or two gene pairs. What types of ratios are likely to occur in crosses
likoan [24]

Answer:

Genotype ratio: 1, 1:1, 1:2:1

Phenotype ratio: 1, 3:1

Explanation:

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
2 years ago
If an rna-based virus like the one we have here were to be considered a living thing, make an argument as to why the virus's rna
Anika [276]
The virus becoms infection, and they create an epidemic that will last for a long time. This was the case back in the early days.
7 0
3 years ago
Which kind of organism is a heterotroph?
just olya [345]
Autotrophs are organism that is a Heterotroph. 
7 0
3 years ago
Chloroplasts and mitochondria have something in common that supports the theory of endosymbiosis. What is it?
Vilka [71]

Answer: A) Mitochondria and chloroplasts are found in prokaryotes.

Explanation:

Both mitochondria and chloroplasts contain their own DNA and ribosomes.  The first endosymbiotic event occurred: The ancestral eukaryote consumed aerobic bacteria that evolved into mitochondria. In a second endosymbiotic event, the early eukaryote consumed photosynthetic bacteria that evolved into chloroplasts.

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2 years ago
Which of the following could create a tropic cascade?
PilotLPTM [1.2K]

Answer:

the disappearance of lions

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