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guajiro [1.7K]
3 years ago
13

Which came first: sexual or asexual reproduction?

Biology
1 answer:
cupoosta [38]3 years ago
8 0

If i remember correctly asexual reproduction came first because without asexual reproduction the cells would not have been able to produce other cells so what few cells there were reproduced asexually and then it evolved onto sexual reproduction later in development

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a man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to
Nonamiya [84]
This information is not enough to tell which of the traits-blood group A or O is dominant.
It is known that blood groups A and B are codominant, which means both will express if found together in a heterozygote. However, blood group O is recessive. But from this information, you can conclude that blood group O is dominant. Why is that so?
Let's imagine that father's genotype is AA and mothers' genotype OO and cross them:
Parents:               AA    x    OO
Offspring:      AO    AO   AO    AO
Since we have information that daughter has blood group O, we can conclude that O is dominant over A and mask it. This is not true! In this case, the daughter will have blood group A.

Mother's genotype surely is OO (because O allele is recessive, so to express a recessive trait both alleles must be recessive). But, the father cannot be AA, because it must give O allele to the daughter so she can have genotype OO and blood group O. So, the father's genotype is AO.  Let's take a look at that crossing:
Parents:         AO   x    OO
Offspring:   AO   AO   OO   OO
Thus, in this case, daughter can have genotype OO and blood group O.
3 0
3 years ago
"Which mode of inheritance produces heterozygotes with phenotypes that differ from either homozygote but typically more closely
lyudmila [28]

Which mode of inheritance produces heterozygotes with phenotypes that differ from either homozygote but typically more closely resembles one homozygous phenotype than the other?"

A) complete dominance

B) incomplete dominance

C) codominance

D) epistasis

E) incomplete penetrance

Answer:

B) incomplete dominance

Explanation:

Incomplete dominance occurs when the dominant allele of a gene is not able to mask the expression of the recessive allele completely. This results in the expression of a phenotype in the heterozygous genotypes that differ from both homozygous genotypes. However, the phenotype of the heterozygote is closer to one of the homozygous genotypes.

For example, the petal color in four o'clock plant is controlled by a gene with two alleles R and r. Here, the "R" allele can not produce enough pigment in heterozygous conditions to completely mask the expression of the "r" allele and the phenotype of the "Rr" plant is "pink". On the other hand, the phenotype of "RR" plant is red while that of the "rr" plant is "white".

5 0
3 years ago
One statement is an example of a scientific observation. Another statement is an example of a scientific explanation. Identify t
liberstina [14]

Answer:

The results of scientific explanation can be drawn through scientific observation and data.

Explanation:

Scientific explanations are inferred or concluded from scientific observations that was taken by the researcher because these scientific observation provides information and data to the researcher in order to formed scientific explanation from it. We can conclude scientific explanation if we have the scientific observation or in other words, The results of scientific explanation can be drawn through scientific observation and data.

8 0
3 years ago
Can someone do a b c for me
oee [108]

Answer:

a) 35

b) 8

Explanation:

i cant do c but i think these are the right answers

6 0
3 years ago
There are many enzymes found in the human body. What is the function of these enzymes?
BabaBlast [244]

Answer:

There are thousands of enzymes in the human body, here are just a few examples: Lipases – a group of enzymes that help digest fats in the gut. Amylase – helps change starches into sugars. ... Lactase – also found in the small intestine, breaks lactose, the sugar in milk, into glucose and galactose.

Explanation: hope this helps

5 0
3 years ago
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