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satela [25.4K]
3 years ago
14

What two things do scientists use to study the evolutionary trends in vertebrates​

Biology
1 answer:
laiz [17]3 years ago
4 0

Fossil Record and characteristics of today's chordates

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this is what u usually learn in these grades for technology

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Put the steps of the carbon cycle in order using Step 1 as your starting point. Step 1: Bacteria, through nitrogen fixation and
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Fats are broken down into saturated fats and unsaturated fats. which of these explains the difference between saturated and unsa
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Identify the genotype for this pedigree chart
AVprozaik [17]

Lets say that the genotypes are:

Male affected:XbY

Male unaffected: XaY

Female  affected: XbXb

Female carrier: XaXb

Female unaffected:XaXa

P: XbY  x  XaXa

F1: XaXb  XaXb  XaY  XaY The middle square is female carrier.

P:XbY  x  XaXb

F1: XaXb  XbXb  XaY  XbY The left square is affected female.

P:XaY  x  XbXb

F1: XaXb  XaXb  XbY  XbY The right square is affected male.


6 0
2 years ago
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<u> they are diploid organisms, which have two copies of each gene. </u>

<u>Each plant produces gametes, which are haploids cells. That is, they only have one copy of each gene (one allele)</u>. 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). <u>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</u>. 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.

4 0
3 years ago
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