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Explain why traits that are controlled by genes on the same chromosome do not always appear in the expected ratio in offspring.e

laila [671]

This is because the Crossing over during meiosis cause is a homologous chromosomes to exchange alleles resulting in new combos of alleles in the offspring. Crossing over occurs between prophase 1 and metaphase 1 and is the process where homologous pair up with each other and exchange different segments of their genetic material to form recombinant chromosomes. It can also happen during mitotic division, which may result in loss of heterozygosity.

8 0

4 years ago

Now consider a single base mutation in a codon for leucine that creates a codon for phenylalanine. A true reversion changes the

madam [21]

Answer:

options A, B, D and E

Explanation:

leucine codons include: UUA, UUG, CUU, CUC, CUA, CUG

phenylalanine codons include: UUU, UUC.

CUU

replace C with U to give

UUU phenylalanine codon

replace underlined with A

UUA leucine codon

CUC

replace underlined with U

UUC phenylalanine codon

replace underlined with A or G

UUA, UUG leucine codons

UUG

replace underlined with U

UUU phenylalanine codons

replace underlined with C

CUU leucine codon

UUA

replace underlined with U or C

UUU or UUC phenylalanine codons

replace U with C

CUU or CUC leucine codons

7 0

3 years ago

A blue-eyed, left-handed woman marries a brown-eyed, right-handed man who is heterozygous for both of his traits. if blue eyes a

Pavel [41]

4 different phenotypes may be produced. If you write this down in a Punnet square you can get the exact ratio and the genotypes along with the phenotypes.

Let us assign B for brown eyes, b for blue eyes; H for right-handed, h for left-handed.
The mother's genotype will then be bbhh
The father's genotype will then be BbHh

bh bh bh bh
BH BbHh   BbHh BbHh   BbHh
Bh Bbhh Bbhh    Bbhh   Bbhh
bH bbHh bbHh    bbHh   bbHh
bh bbhh bbhh bbhh bbhh

Now based on that you can see that there are 4 possible genotypic combinations which would express different phenotypic combinations as well.

BbHh: Brown-eyed, right-handed
Bbhh: Brown-eyed, left-handed
bbHh: Blue-eyed, right handed
bbhh: Blue-eyed, left-handed

So again, there would be 4 possible phenotypes.

3 0

4 years ago

Read the questions and select the best answer. Which carbohydrate(s) provide short-term energy storage?

likoan [24]

Complex carbohydrates is the answer

7 0

3 years ago

Read 2 more answers

Which statement describes the condition of the heart at the point indicated in the electrocardiogram?

scoundrel [369]

The muscles of the ventricles depolarize.

<h3>What is the depolarization of the ventricles?</h3>

The auxiliary route (AP), which connects the atrial and ventricle directly and is, therefore, able to channel electrical impulses into the ventricle without via the AV-His Purkinje conduction system, is one of the mechanisms by which the ventricle depolarizes.

An electrocardiogram, often known as an ECG, is a test that aids in calculating and graphing the electrical activity of the heartbeat. Every time the heart beats, a wave or electrical impulse travels through the organ, causing the muscles to contract and the blood to be pumped from the heart's chambers. Ventricular Depolarization physically occurs in the heart with QRS Complex.

Learn more about ventricles depolarize here:

brainly.com/question/26556968

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5 0

2 years ago