A catastrophic event that causes many different species in a short period of time is know as a

Y-: yellow S-: star yy: black ss: starless

Ede4ka [16]

Answer:

1. heterozygous yellow and star

2. 37

3. 1/8

4. 168

5. 1/4

Explanation:

Given ,

In f1 generation a cross is made between a true breeding black star bellied sneetch mated with a true breeding yellow starless sneetch

yySS x YYss

It is taken as - Y (yellow) is dominant over y (black)

and S (star) is dominant over s (starless)

1. F1 Generation

Genotype of parents yySS X YYss

gametes - yS, yS, Ys, Ys

All 16 offspring will have genotype YySs

phenotype would be heterozygous yellow and star

2. F2 generation cross

YySs X YySs

YS Ys yS ys

YS YYSS YYSs YySS YySy

Ys YYSs YYss YySs Yyss

yS YySS YySs yySS yySs

ys YySs Yyss yySs yyss

Genotype of offspring are –

YYSS – 1

YYSs – 2

YySS – 2

YySs – 4

YYss- 1

Yyss- 2

yySS – 1

yySs- 1

yyss- 1

2. Out of 16, 2 are black star bellied sneetches . Which means only 1/8 are black star bellied sneetches

So out of 300, 37 are black star bellied sneetches

3. Only 2 out of 16 are true breeding. i.e 1/8

4. 9 out of 16 are yellow star bellied sneetches, so out of 300, 168 are yellow star bellied sneetches

5. 4 out of 16 are true breeding yellow. Thus, ¼ are true breeding

7 0

3 years ago

What properties do the following have common: A.Solids and liquids B.Liquids and gases

fenix001 [56]

Explanation:

Liquids and gases are similar in both shape and volume because they both have its shape determined by its surroundings.

Gases, liquids and solids are all made up of atoms, molecules, and/or ions

7 0

3 years ago

The substance on which the enzyme acts is called the _____.

d1i1m1o1n [39]

It is called a substrate.

3 0

4 years ago

Read 2 more answers

A population of 150 fish have two alleles for the size of a black spot on their sides: large spot alleles and small spot alleles

MAVERICK [17]

Answer:

1. genetic drift; 2. natural selection; 3. gene flow; 4. natural selection

Explanation:

1. A fish net captures twenty fish, all who happened to have large spots: 

The mechanism of evolution that is playing out in this situation is most likely genetic drift. Genetic drift occurs when a random change occurs, resulting in the selection of a number of individuals by chance, rather than based on their level of fitness. The fish with large spots allele were selected against by chance, not necessarily because the fish with the small spot alleles were better fitted.

2. Small spotted fish escape from predators better:

The situation here is natural selection. The small spotted fish possess a greater fitness as they become well adapted to escaping from predators better than the large spotted fish, which gives confers on them a greater fitness to be selected for against the large spotted fish.

3. 15 large spotted fish move into this population:

The movement or introduction of new individuals i nto a population is what is referred to as gene flow in evolution, which is another mechanism of evolution that changes the allele frequency of the original population.

4. Fish-eating birds catch large spotted fish more easily:

This is another example of natural selection. The small spotted fish possess a greater fitness which makes them not easily preyed upon by Fish-eating bird easily, compared to large spotted fish. Natural selection favors the fish with small spotted alleles against the large spotted fish, and as a result, more small spotted fish would survive and reproduce more offspring with the small spotted alleles compared to those with large spotted alleles.

4 0

3 years ago

Which hormonal deficiency would increase the client's risk for fractures?

serg [7]

It is called the Growth hormone deficiency, a medical condition due to insufficient growth hormone. The common symptoms is a short height, low blood sugar in newborns, and decreased muscle mass, high cholesterol levels and poor bone density in adults.

3 0

4 years ago