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Lelechka [254]
3 years ago
14

PLS HELP ASAP

Biology
1 answer:
kherson [118]3 years ago
6 0
Species change over time. -The mechanism that produces the change is natural selection: the differential survival and reproduction of individuals based on variation in their traits. Natural selection acts on individuals but individuals do not evolve; their descendants do.
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Why is a parent usually a better match for transplanted tissue to a donor than a random individual of the same species?
s344n2d4d5 [400]

Answer: For decreased chances of rejection

Explanation:

The three higly polymorphic MHC 1 genes in human beings are HLA-A, HLA-B and HLA-C.

These determine the compatibility of the organ or tissue in the recipient's body each by the help of many alleles that segregates in a population.

There are very less chances that a random chosen donor will match the a recipient six allele genotype.

This is the reason parent  may be the best donor for organ transplantation or tissue transplantation.

7 0
3 years ago
A heterozygous genotype is when the alleles present are ______________, such as Bb.
Anuta_ua [19.1K]

'Different' is the answer!

6 0
3 years ago
Please help me !!!!!
Annette [7]
The answer is C because it is the only one that makes sense to that question. 
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3 years ago
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Tju [1.3M]
Because of photosynthesis
6 0
3 years ago
Albinism is a recessive trait in humans that is controlled by a single gene. How many recessive alleles must a person have to ha
olga_2 [115]
Answer;
Two recessive alleles are the number of alleles that a person must have to have albinism.

Explanation;
When a trait is recessive, such as albinism, an individual must have two copies of a recessive allele to express that particular trait. Recessive alleles are denoted by a lowercase letter , such as b versus B. Only individuals with a bb genotye will express a recessive trait, hence, the offspring must receive one recessive trait from each parent to exhibit the recessive trait. 

6 0
3 years ago
Read 2 more answers
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