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Lynna [10]
3 years ago
10

Commercial plant growers artificially control the lengths of days and nights. This produces a response called

Biology
2 answers:
Olenka [21]3 years ago
6 0

the answer is A. Photoperiodism

Hope this helps!

leonid [27]3 years ago
5 0
The answer is A. photoperiodism.

Photoperiodism is an organism reaction to the lengths of days and nights. Some plants require longer days, and some require shorter days. By changing the lengths of days and nights, commercial plant growers are able to increase plants productivity.

Tropism is plant growth in a response to a stimulus.
As it name suggests, <em>photo</em>tropism is plant growth in a response to light. 
<em>Gravi</em>tropism is plant growth in a response to gravity.
Thigmotropism is plant growth in a response to contact
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In humans, the trait for tongue rolling is dominant over the trait for the inability of a human to roll his/her tongue. If a het
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50 percent of the offspring would be expected to have the ability to roll their tongues If a heterozygous male is crossed with a homozygous recessive female.

Explanation:

Information given:

the ability to roll tongue is dominant, the genotype would be RR, Rr

the inability to roll tongue is recessive trait the genotype = rr

Given that heterozygous male is crossed with homozygous recessive female, the genotype is

Rr X rr

Punnet square shows that:

    R    r

r   Rr  rr

r  Rr  rr    The genotype ratio is 1:1

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There are chances of 50 % offspring having the ability to roll their tongues as they are heterozygous and have the dominant allele for rolling of tongues.

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How does a population experience variation in traits?
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