25. How does natural selection affect behavior?

Biology

1 answer:

zhannawk [14.2K]2 years ago

8 0

Explanation:

In many cases, behaviors have both an innate component and a learned component. Behavior is shaped by natural selection. Many behaviors directly increase an organism's fitness, that is, they help it survive and reproduce.

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A hybrid _____.

Serhud [2]

Answer: is heterozygous

Explanation: A hybrid is heterozygous which means that it has one dominant gene and one recessive gene. A dominant gene is a type of gene which has the ability to express itself phenotypically either in a homozygous or a heterozygous state. A dominant gene masks the effect of a recessive gene. A recessive gene is a type of gene that lacks the ability to express itself in a heterozygous state. It can only express itself outwardly in a homozygous state. It's effect is masked by the dominant gene is a heterozygous state.

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Vanyuwa [196]

I think the answer is 80

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In pea plants, purple flowers are dominant to white flowers, and the purple and white alleles are represented with P and p, resp

amm1812

Answer: 75% of the plants are purple and 25% are white. The phenotypic ratio can be expressed as 3:1.

Explanation:

Heterozygous means that its genotype has two distinct alleles, i.e. a dominant and a recessive one. So the genotype of the plants is Pp, and each plant has two alleles since they are diploid organisms, which have two copies of each gene.

Each plant produces gametes, which are haploids cells. That is, they only have one copy of each gene (one allele). So, the gametes produced by Pp have a P or p genotype. During fertilization, the maternal and paternal gamete are fused to form a diploid zygote where their genotype will have one allele from the father and one from the mother.

By making this monohybrid cross, we cross the gametes of each parent in the punnett square (see picture)

In the offspring, we see one PP genotype (homozygous dominant), two Pp genotypes (heterozygous) and one pp genotype (homozygous recessive). Since we know the P allele is dominant and it codes for purple color, a genotype only needs one P allele to express that phenotype. So Pp and PP organisms are purple, and only pp is white. That means 75% of the plants are purple and 25% are white. The phenotypic ratio can be expressed as 3:1.

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