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kolezko [41]
3 years ago
7

If a homozygous dominant (aa) is crossed with a homozygous recessive (aa) for a given character, the offspring will be _____.

Biology
1 answer:
pshichka [43]3 years ago
8 0
Vz vdfjlkdofpaskfjdfiaejfjjpodfkjd;jhoejffigehrofirhfkfgodovfo fihfi f f f f   f f f f f  f
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What organelle converts sunlight energy into chemical energy in plants and is green?
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Chloroplast is the organelle and Chlorophyll is the thing that makes it green.
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3 years ago
Which of the followng eras in know as the Age of the Dinosaurs
Soloha48 [4]

Age of the Dinosaurs is also known as the "Middle Life" era

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2 years ago
How do cells at the completion of meiosis compare with cells that are in prophase of meiosis I? (A) The cells have half the numb
Sedbober [7]

Cells at the completion of meiosis compare with cells that are in prophase of meiosis I is (A) The cells have half the number of chromosomes and half the amount of DNA.  

The correct option is (A).

  • The cells produced at the end of meosis cell division have half the number of chromosomes (termed as Haploid), so they will have half the number of chromosomes but same DNA as that of the parent cell as DNA divides and makes a copy of the parent cell DNA.
  • Meiosis is a form of cell division of germ cells that creates gametes such as sperm or egg cells in sexually reproducing animals. It consists of two rounds of division that result in four cells with just one copy of each chromosome (haploid). Prior to division, genetic material from the paternal and maternal copies of each chromosome is crossed across, resulting in novel code combinations on each chromosome.
  • During fertilisation, the haploid cells generated by meiosis from a male and female will unite to form a zygote, a cell with two copies of each chromosome.

To learn more about Meiosis.

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3 0
1 year ago
Researchers can genetically select lettuce crops to cultivate for pest resistance. One of the concerns scientists have about gen
kirill115 [55]

One of the concerns regarding genetic selection is that some traits for pest resistance may affect the texture of lettuce, it is known as pleiotropic effects.

<h3>What is a pleiotropic effect?</h3>

In genetics, a pleiotropic effect occurs when one gene influences the phenotypic expression of several traits.

Pleitropic effects represent a problem in breeding programs because positive selection for a trait can also produce negative selection for another trait.

In conclusion, one of the concerns regarding genetic selection is the presence of pleiotropic effects.

Learn more about pleiotropic effects here:

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6 0
1 year ago
If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells, _______
hodyreva [135]

Answer:

C. tetanic contractions might occur, which would stop the heart's pumping action.

Explanation:

The absolute refractory period of the cardiac muscle action potential refers to the time interval when the voltage gated sodium channels are inactivated. The absolute refractory period lasts ~180 msec. The action potential lasts 200-220 msec.

The refractory period of cardiac muscle is dramatically longer than that of skeletal muscle. This prevents tetanus from occurring and ensures that each contraction is followed by enough time to allow the heart chamber to refill with blood before the next contraction.

In order words, It is important for the cardiac muscle cells to have a longer refractory period, because if they were short like the skeletal muscles, the heart could enter tetanic contraction/summation which is when muscle is stimulated so rapidly that it does not have a chance to relax at all between stimuli.

7 0
3 years ago
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