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cluponka [151]
3 years ago
14

What was the purpose of Mendel's experiments with dihybrid crosses?

Biology
1 answer:
adelina 88 [10]3 years ago
8 0
The answer is A as this is how we discovered alleles and their dominant/recessive nature.

Theoretically if traits were controlled by only 1 gene then every time you bred 2 purple flowers together you would always get offspring that are also purple, but if there were 2 genes and these 2 flowers had recessive white alleles then some offspring would be white.
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This monarch butterfly has orange wings. Is orange<br> the genotype or the phenotype? Explain
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Answer:

Phenotype

Explanation:

It's phenotype because a genotype is not a physical trait; a genotype means genes. It's phenotype because it a physical trait you can see. Lets say twins look the same on the outside but on the inside they have completely DNA. This is like how some butterflies look the same with orange wings but one might have a mutation in its genes.

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Assuming that both parents are heterozygous for the gene that causes the disease, what is the probability that the second child
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The independent assortment of genes is a principle of Mendel and of genetics. Since humans are diploid organisms (they have 2 copies of their genetic information), we have that each gamete carries one of the two available alleles for each feature. These gametes are created in equal proportions.

We have that both parents are heterozygous for a feature, lets say H. Thus, their genotype is Hh. Hence, the child will get with probability 50%=1/2 H from the father and 50%=1/2 h from the father; same from the mother. By doing a Punnett square, we get that there is 1/4 chance that the child is HH, 1/2 chance that it is Hh and 1/4 that is hh. Since the disease is recessive (so both alleles are needed), we have that the chance that the kid has the disease is 1/4.
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