Does a humming bird migrate

Compared to mammals in colder climates, mammals that live in very hot, dry ecosystems tend to

777dan777 [17]

Answer:

X. Mechanisms and habits that include limit water loss.

Explanation:

Many mammals that live in dry ecosystems tend to have above adaptations because there is a shortage of water in these areas. And of course water is the most essential thing for survival.

3 0

3 years ago

What situation is an example of artifical selection

ss7ja [257]

Answer:

An example situation of artificial selection is "More African elephants today naturally lack tusks compared to the elephant populations 100 years ago, because big game hunters sought elephants for ivory".

Explanation:

The process of breeding animals to acquire the desired characteristics by the external means other than natural selection and behavior of animal itself is called as artificial selection.

The first artificial selection was carried out by Darwin when he mated penguins that would have a higher chance of breeding.

The practice of artificial selection was existing in human civilization a long time ago.

This process was used to use wild animals and domestic animals in battles and other household works.

3 0

3 years ago

The bacterium caulobacter crescentus is able to form long cell envelope extensions that increase the surface area-to-volume rati

MArishka [77]

The job of these envelope extensions is to increase the bacteria's surface area so they can absorb more nutrients and grow. This is especially important in an adverse environment that lacks a lot of resources.

5 0

3 years ago

Read 2 more answers

What characteristics do monocots have? What characteristics do dicots have?

LuckyWell [14K]

Answer: MONOCOT

1) seeds with one cotyledon.

2) the plants have fibrous root system

3) leaves have parallel venation

4) the petals of flowers are trimerous(3 petals)

DICOT

1) seeds with two cotyledon.

2) the plants have taproot system.

3) leaves have reticulate venation

4) the petals of flowers are pentamerous (5 petals)

Explanation:

5 0

3 years ago

A female fly that has miniature wings and sepia eyes is crossed with a male that has normal wings and is homozygous for red eyes

Eduardwww [97]

Answer and Explanation:

The gene that expresses the size of the wing is X-linked. The dominant allele expresses long wings, XM, while the recessive allele expresses miniature wings, Xm.

The gene that expresses the color of the eyes is autosomal. The dominant allele expresses red color, S, and the recessive allele expresses sepia color, s.

A female fly that has miniature wings and sepia eyes (XmXm ss) is crossed with a male that has normal wings and is homozygous for red eyes (XMY SS).

The F1 are intercrossed to produce the F2.

1º Cross:

Parental) XmXm ss x XMY SS

Gametes) Xms Xms Xms Xms

XMS XMS YS YS

Punnet Square) Xms Xms Xms Xms

XMS XMXmSs XMXmSs XMXmSs XMXmSs

YS XmY Ss XmY Ss XmY Ss XmY Ss

F1) 1/2 or 50% of the progeny are females and the other 1/2 or 50% are males

100% of the females (1/2 or 50% of the progeny) are long-winged and red-eyed

100% of the males (1/2 or 50% of the progeny) are miniature.winged and red-eyed.

2º Cross:

Parental) XMXm Ss x XmY Ss

Gametes) XMS XMs XmS Xms

XmS Xms YS Ys

Punnet Square) XMS XMs XmS Xms

XmS XMXm SS XMXm Ss XmXm SS XmXm Ss

Xms XMXm Ss XMXm ss XmXm Ss XmXm ss

YS XMY SS XMY Ss XmY SS XmY Ss

Ys XMY Ss XMY ss XmY Ss XmY ss

F2) 8/16=4/8=1/2 or 50% of the progeny are females and the other 1/2 or 50% are males

Females (8/16):

3/8 of the females are long-winged and red-eyed, XMX- S-

1/8 of the females are long-winged and sepia-eyed, XMX- ss

3/8 of the females are miniature-winged and red-eyed, XmXm S-

1/8 of the females are miniature-winged and sepia-eyed, XmXm ss

Males (8/16):

3/8 of the males are long-winged and red-eyed, XMY S-

1/8 of the males are long-winged and sepia-eyed, XMY ss

3/8 of the males are miniature-winged and red-eyed, XmY S-

1/8 of the males are miniature-winged and sepia-eyed, XmY ss

Note: The symbol "-" means that in its place might be a recessive allele or a dominant allele. For example, S- means that it might be SS or Ss.

4 0

3 years ago