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MLA
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Biological & Biomedical Sciences
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Mendel’s Law of Segregation: Provide An Example Of A Monohybrid Cross (Essay Sample)

Instructions:

Mendel’s laws of segregation and independent assortment explain the basics of heredity. Punnett squares are used to follow traits passed on to offspring. In order to understand this better, provide an example of a monohybrid cross and a dihybrid cross NOT from the textbook (textbook example its bean, so don't use bean again) and be sure to explain specifically what is on the outside of the boxes (what is being represented) and what is inside the boxes (what process is this?).
For the second part of the assignment, indicate why a testcross would be used and what is meant by dominance and recessiveness. Is the “normal” allele always the dominant one and if not, why not?

source..
Content:

Your Name
Subject and section
Professor’s Name
July 7, 2019
Mendel’s Law of Segregation
Part 1
Some examples of a monohybrid cross and a dihybrid cross are provided below. First, a monohybrid cross happens when two organisms, with only a single trait of difference, mated CITATION Ari04 \l 1033 (Arizona.edu, 2004). As an example, this could happen when a black (B) and a brown rat (b) mates with each other. In the table presented below, it could be seen how the different traits would interact with each other. The two rats in this example are both heterozygous, as presented in the outside boxes, thus having a black phenotypic trait. Since each of them has a recessive allele, it could be seen that when a dominant trait (B) mixes with a recessive trait (b), the phenotype of the dominant trait would always appear (e.g., BB and Bb). In contrast to this, the phenotype of a recessive trait would only appear in cases when the two recessive alleles mix with each other (e.g., bb). In ratio form, the probability of having the black and brown phenotypes appear in this case is three-fourths and one-fourth, respectively.

B

b

B

BB

Bb

b

Bb

bb

In contrast to a monohybrid cross, a dihybrid cross contains two differences in traits. Going back to the example presented above, the traits of the two rats can also be differentiated when it comes to the length of their tails. A table containing a dihybrid cross is presented below.

BL

Bl

bL

bl

BL

BLBL

BLBl

BLbL

BLbl

...
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