Question 4

2 answers:

8 0

<span>"To increase the production of milk in a herd of milk cows, the highest producing cows were chosen as the mothers." is selective breeding because they selectively chose which cows to breed.
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Marina86 [1]4 years ago

6 0

Answer:

The correct answer would be the first option.

Selective breeding is the process by which humans select and interbreed specific breeds of plants or animals in order to produce the offspring with the desired trait.

For example, for high milk yield, the cows with the highest milk production are selected and interbreed to produce offspring with high milk yield.

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In cucumbers, dull fruit (D) is dominant over glossy (d) fruit, orange friut (R) is dominant over cream fruit (r), and bitter co

stiv31 [10]

Explanation:

Dull fruit (D) is dominant over glossy (d) fruit.
Orange friut (R) is dominant over cream fruit (r).
Bitter cotyledon (B) is dominant over non-bitter cotyledons (b).

The three genes are independent.

A plant homozygous for dull, orange fruit and bitter cotyledons has the genotype <em>DDRRBB</em><em>.</em>
A plant homozygous for glossy, cream fruit and non-bitter cotyledons has the genotype <em>ddrrbb</em>.

100% of the F1 will have dull, orange fruit and bitter cotyledons and will be heterozygous for all genes: <em>DdRrBb</em>.

<u>The F2 will have 8 possible phenotypes:</u>

27 D_R_B dull, orange fruit and bitter cotyledons
9 D_R_bb dull, orange fruit and non-bitter cotyledons
9 D_rrB_ dull, cream fruit and bitter cotyledons
3 D_rrbb dull, cream fruit and non-bitter cotyledons
9 ddR_B_ glossy, orange fruit and bitter cotyledons
3 ddR_bb glossy, orange fruit and non-bitter cotyledons
3 ddrrB_ glossy, cream fruit and bitter cotyledons
1 ddrrbb glossy, cream fruit and non-bitter cotyledons

An F1 plant is crossed with a plant that has glossy, cream fruit and non-bitter cotyledons.

<h3>DdRrBb x ddrrbb </h3>

The F1 individual can produce 8 types of gametes: DRB, DRb, DrB, Drb, dRB, dRb, drB and drb. The cream fruit and non-bitter cotyledons individual can only produce drb gametes. This cross also produces a progeny with the following genotypes and phenotypic proportions: