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Law Incorporation [45]
3 years ago
7

Why are lethal dominant alleles so much more rare than lethal recessive alleles?

Biology
1 answer:
Lisa [10]3 years ago
4 0

The correct answer is: d. Lethal dominant alleles are harmful whether they are carried in homozygous or heterozygous form, so there is always strong selection against these alleles.

Lethal alleles cause the death (prenatal or after birth, but usually early in development) of the organism that carries them. There are three types of lethal alleles:  

• Recessive-both alleles must be defective,  

• Dominant-it is sufficient that one allele is lethal to cause the death,

• Conditional depending on the gene or genes involved.  

Lethal alleles are usually a result of mutations in genes essential for development of an organism.

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Why does the grass look green under sunlight and black under the moonlight?
Mice21 [21]

Answer: The original colour of grass is green because of photosynthesis. But in terms of reflection, it looks green because the sunlight reflects the green colour off the grass, so we see it as green.

Explanation: Sun appears white, but it is made up of the colors: red, orange, yellow, green, blue, indigo, and violet. When white light hits an object, it absorbs some colors and reflect the others. Grass appears green because it absorbs all the wavelengths except green. Green is reflected off the grass, so we see grass as green. The moon doesn’t have light of its own, the moon lights up because of the sun. So at night, as the light of the sun doesn't reach the grass directly because of the moon, it doesnt reflect any color off the grass, and so our eyes detect grass as black.

4 0
3 years ago
Modern taxonomy classifies living
Mashutka [201]

Monera

Explanation:

Modern taxonomy classified living things into five different categories:

  • Plants
  • Animals
  • Fungi
  • Protists
  • Monera

  • Monera is a kingdom of life that is made up of unicellular prokaryotic organisms.
  • They are made up of organisms with no true nuclear membrane.
  • They are made up of bacteria and Archea
  • Organisms of the Monera kingdom are beneficial to man and also causes diseases.
  • They are ubiquitous and nearly found every where.

learn more:

Kingdom of life brainly.com/question/5186929

#learnwithBrainly

4 0
3 years ago
Can plants be heterozygous?
svet-max [94.6K]

The plants ploidy is decided based on the chromosome within the nucleus . Plant can be either heterozygous or homozygous.

The major distinction between homozygous and heterozygous individuals is that the former have two identical alleles while the latter have both dominant and recessive alleles. Over several generations, kids with the same characteristic are produced through self-breeding between homozygous individuals.

Heterozygous and homozygous chromosomes are seen in human beings. Allele pairings are categorized as Heterozygous and Homozygous. A heterozygous person possesses various alleles, whereas a homozygous person carries a pair of identical (RR or rr) alleles (Rr).

Let's take the gene for hair colour as an example. This gene has two alleles, one of which is responsible for black (r), and the other for black (R). On a homologous set of chromosomes, such as RR or rr, homozygous people will carry the same colour allele, but heterozygous people will carry distinct colour alleles.

Hence, depending on type allele can be homozygous or heterozygous.

To know more about Chromosome.

brainly.com/question/296477

#SPJ4

4 0
1 year ago
This cyclin is found in the s phase of the cell cycle.
wariber [46]

Answer:

Cyclines in phase s double their DNA.

Explanation: Hello, In this phase the cyclin doubles in a strictly regulated and conserved manner.

4 0
3 years ago
_______ is a macromolecule that holds cell information in a coded form. Made of sugar
Amiraneli [1.4K]

Answer:

Nucleic Acids

Explanation:

Nucleic acids are made out of nucleotides and they come in two forms: Deoxyribonucleic Acid (DNA) and Ribonucleic Acid (RNA). DNA holds the code of life, in other words, it holds the code for making proteins that are essential in building cells, tissues, and organs. DNA is found in the nucleus of a cell.

4 0
4 years ago
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