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3 years ago

1. Which statement best describes Mendel's experiments? sc.7.L.16.1

Biology

1 answer:

lara31 [8.8K]3 years ago

4 0

Answer:

B. He controlled pollination.

Explanation:

The statement that best described Mendel's experiment is that he controlled pollination.

Mendel carried out several experiments to study the pattern of inheritance of traits in pea plant. He cross bred phenotypically different pea plants and he was able to make certain conclusions based on how traits are inherited. He could only have been able to crossbreed plants by controlling pollination in the plant.

Mendel did not begin with hybrid plants. A hybrid plant is a product of crossbreeding two different organisms and often carry a mix of traits from the two organisms. Rather, Mendel started with pure breeding pea plants.

Mendel also observed more than one generations. He advanced several of the crossbreeding experiment to F2 generation before propounding the laws of genetics.

Mendel used a plant with short life cycle. They reproduce fast and as such, he was able to study different generations within a short period.

The correct option is B.

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Which of these is a way the immune system works with other body systems?

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Answer:

A. The spleen filters pathogens from blood

Explanation:

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2 years ago

Give importances of locomotion in man

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Answer:

Locomotion is essential for various internal and external bodily functions

Explanation:

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3 years ago

I Will Give BRIANIEST

dolphi86 [110]

Answer:

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3 years ago

Read 2 more answers

In a symbiotic relationship, A a parasite eats its host. B there are too many carbon emissions in the atmosphere. C the environm

cupoosta [38]

Answer:

D two organisms depend on each other for survival.

Explanation:

Symbiotic relationship is a type of relationship between two organisms in which the both of them gain something positive from each other. A good example is the relationship between the cattle and egret. The egret helps in grooming the cattle and the cattle in return provides food for the egret.

In a symbiotic relationship, two organisms depend on each other for survival and is the right choice in the above question.

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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.

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3 years ago